# ------------------------------------------------------------------------------
# This file is part of Appy, a framework for building applications in the Python
# language. Copyright (C) 2007 Gaetan Delannay
# Appy is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 3 of the License, or (at your option) any later
# version.
# Appy is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along with
# Appy. If not, see .
# ------------------------------------------------------------------------------
import sys, re, os.path
from appy import Object
from appy.fields import Field
from appy.fields.search import Search
from appy.px import Px
from appy.gen.layout import Table
from appy.gen import utils as gutils
from appy.shared import utils as sutils
# ------------------------------------------------------------------------------
class Ref(Field):
# Some default layouts. "w" stands for "wide": those layouts produce tables
# of Ref objects whose width is 100%.
wLayouts = Table('lrv-f', width='100%')
# "d" stands for "description": a description label is added.
wdLayouts = {'view': Table('l-d-f', width='100%')}
# This PX displays the title of a referenced object, with a link on it to
# reach the consult view for this object. If we are on a back reference, the
# link allows to reach the correct page where the forward reference is
# defined. If we are on a forward reference, the "nav" parameter is added to
# the URL for allowing to navigate from one object to the next/previous one.
pxObjectTitle = Px('''
::tied.o.getSupTitle(navInfo)::tied.o.getListTitle(nav=navInfo, target=target, page=pageName, \
inPopup=inPopup)::sub''')
# This PX displays buttons for triggering global actions on several linked
# objects (delete many, unlink many,...)
pxGlobalActions = Px('''
''')
# This PX displays icons for triggering actions on a given referenced object
# (edit, delete, etc).
pxObjectActions = Px('''
:tied.pxTransitions
''')
# Displays the button allowing to add a new object through a Ref field, if
# it has been declared as addable and if multiplicities allow it.
pxAdd = Px('''
''')
# Displays the button allowing to select from a popup objects to be linked
# via the Ref field.
pxLink = Px('''
''')
# This PX displays, in a cell header from a ref table, icons for sorting the
# ref field according to the field that corresponds to this column.
pxSortIcons = Px('''
''')
# Shows the object number in a numbered list of tied objects.
pxNumber = Px('''
:objectIndex+1
''')
# PX that displays referred objects as a list.
pxViewList = Px('''
:tool.pxNavigate
''')
# PX that displays the list of objects the user may select to insert into a
# ref field with link="list".
pxViewPickList = Px('''
:field.pxViewList''')
# PX that displays referred objects as dropdown menus.
pxMenu = Px('''
:menu.text:len(menu.objects)''')
pxViewMenus = Px('''
:field.pxAdd ''')
# Simplified widget showing minimal info about tied objects.
pxViewMinimal = Px('''
:', '.join(infos) or _('no_ref')''')
# PX that displays referred objects through this field. In mode link="list",
# if, in the request, key "scope" is present and holds value "objs", the
# pick list (containing possible values) will not be rendered.
pxView = Px('''
:field.pxViewPickList
:field.pxViewList
:field.pxViewList:getattr(field, 'pxView%s' % \
render.capitalize())''')
pxCell = pxView
# Edit widget, for Refs with link='popup'.
pxEditPopup = Px('''
-
:field.pxLink''')
pxEdit = Px('''
:field.pxEditPopup''')
pxSearch = Px('''
''')
def __init__(self, klass=None, attribute=None, validator=None,
multiplicity=(0,1), default=None, add=False, addConfirm=False,
delete=None, noForm=False, link=True, unlink=None,
unlinkElement=None, insert=None, beforeLink=None,
afterLink=None, afterUnlink=None, back=None, show=True,
page='main', group=None, layouts=None, showHeaders=False,
shownInfo=(), select=None, maxPerPage=30, move=0,
indexed=False, searchable=False, specificReadPermission=False,
specificWritePermission=False, width=None, height=5,
maxChars=None, colspan=1, master=None, masterValue=None,
focus=False, historized=False, mapping=None, label=None,
queryable=False, queryFields=None, queryNbCols=1,
navigable=False, changeOrder=True, numbered=False,
checkboxes=True, checkboxesDefault=None, sdefault='',
scolspan=1, swidth=None, sheight=None, sselect=None,
persist=True, render='list', menuIdMethod=None,
menuInfoMethod=None, menuUrlMethod=None):
self.klass = klass
self.attribute = attribute
# May the user add new objects through this ref ? "add" may also contain
# a method whose result must be a boolean value.
self.add = add
# When the user adds a new object, must a confirmation popup be shown?
self.addConfirm = addConfirm
# May the user delete objects via this Ref?
self.delete = delete
if delete == None:
# By default, one may delete objects via a Ref for which one can
# add objects.
self.delete = bool(self.add)
# If noForm is True, when clicking to create an object through this ref,
# the object will be created automatically, and no creation form will
# be presented to the user.
self.noForm = noForm
# May the user link existing objects through this ref? If "link" is;
# True, the user will, on the edit page, choose objects from a
# dropdown menu;
# "list", the user will, on the view page, choose objects from a list
# of objects which is similar to those rendered in pxViewList;
# "popup", the user will, on the edit page, choose objects from a popup
# menu. In this case, parameter "select" must hold a Search
# instance.
self.link = link
# May the user unlink existing objects?
self.unlink = unlink
if unlink == None:
# By default, one may unlink objects via a Ref for which one can
# link objects.
self.unlink = bool(self.link)
# "unlink" above is a global flag. If it is True, you can go further and
# determine, for every linked object, if it can be unlinked or not by
# defining a method in parameter "unlinkElement" below. This method
# accepts the linked object as unique arg.
self.unlinkElement = unlinkElement
# When an object is inserted through this Ref field, at what position is
# it inserted? If "insert" is:
# None, it will be inserted at the end;
# "start", it will be inserted at the start of the tied objects;
# a method, (called with the object to insert as single arg), its return
# value (a number or a tuple of numbers) will be
# used to insert the object at the corresponding position
# (this method will also be applied to other objects to know
# where to insert the new one);
# a tuple, ('sort', method), the given method (called with the object
# to insert as single arg) will be used to sort tied objects
# and will be given as param "key" of the standard Python
# method "sort" applied on the list of tied objects.
# With value ('sort', method), a full sort is performed and may hardly
# reshake the tied objects; with value "method" alone, the tied
# object is inserted at some given place: tied objects are more
# maintained in the order of their insertion.
self.insert = insert
# Immediately before an object is going to be linked via this Ref field,
# method potentially specified in "beforeLink" will be executed and will
# take the object to link as single parameter.
self.beforeLink = beforeLink
# Immediately after an object has been linked via this Ref field, method
# potentially specified in "afterLink" will be executed and will take
# the linked object as single parameter.
self.afterLink = afterLink
# Immediately after an object as been unlinked from this Ref field,
# method potentially specified in "afterUnlink" will be executed and
# will take the unlinked object as single parameter.
self.afterUnlink = afterUnlink
self.back = None
if back:
# It is a forward reference
self.isBack = False
# Initialise the backward reference
self.back = back
back.back = self
# klass may be None in the case we are defining an auto-Ref to the
# same class as the class where this field is defined. In this case,
# when defining the field within the class, write
# myField = Ref(None, ...)
# and, at the end of the class definition (name it K), write:
# K.myField.klass = K
# setattr(K, K.myField.back.attribute, K.myField.back)
if klass: setattr(klass, back.attribute, back)
else:
self.isBack = True
# When displaying a tabular list of referenced objects, must we show
# the table headers?
self.showHeaders = showHeaders
# When displaying referenced object(s), we will display its title + all
# other fields whose names are listed in the following attribute.
self.shownInfo = list(shownInfo)
if not self.shownInfo: self.shownInfo.append('title')
# If a method is defined in this field "select", it will be used to
# return the list of possible tied objects. Be careful: this method can
# receive, in its first argument ("self"), the tool instead of an
# instance of the class where this field is defined. This little cheat
# is:
# - not really a problem: in this method you will mainly use methods
# that are available on a tool as well as on any object (like
# "search");
# - necessary because in some cases we do not have an instance at our
# disposal, ie, when we need to compute a list of objects on a
# search screen.
# "select" can also hold a Search instance. In this case, put any name
# in Search's mandatory parameter "name": it will be ignored and
# replaced with an internal technical name.
# NOTE that when a method is defined in field "masterValue" (see parent
# class "Field"), it will be used instead of select (or sselect below).
self.select = select
if isinstance(select, Search):
select.name = '_field_'
select.checkboxes = True
select.checkboxesDefault = False
# If you want to specify, for the search screen, a list of objects that
# is different from the one produced by self.select, define an
# alternative method in field "sselect" below.
self.sselect = sselect or self.select
# Maximum number of referenced objects shown at once.
self.maxPerPage = maxPerPage
# If param p_queryable is True, the user will be able to perform queries
# from the UI within referenced objects.
self.queryable = queryable
# Here is the list of fields that will appear on the search screen.
# If None is specified, by default we take every indexed field
# defined on referenced objects' class.
self.queryFields = queryFields
# The search screen will have this number of columns
self.queryNbCols = queryNbCols
# Within the portlet, will referred elements appear ?
self.navigable = navigable
# If "changeOrder" is or returns False, it even if the user has the
# right to modify the field, it will not be possible to move objects or
# sort them.
self.changeOrder = changeOrder
# If "numbered" is or returns True, a leading column will show the
# number of every tied object. Moreover, if the user can change order of
# tied objects, an input field will allow him to enter a new number for
# the tied object. If "numbered" is or returns a string, it will be used
# as width for the column containing the number. Else, a default width
# will be used.
self.numbered = numbered
# If "checkboxes" is or returns True, every linked object will be
# "selectable" via a checkbox. Global actions will be activated and will
# act on the subset of selected objects: delete, unlink, etc.
self.checkboxes = checkboxes
# Default value for checkboxes, if enabled.
if checkboxesDefault == None:
self.checkboxesDefault = bool(self.link)
else:
self.checkboxesDefault = checkboxesDefault
# There are different ways to render a bunch of linked objects:
# - "list" (the default) renders them as a list (=a XHTML table);
# - "menus" renders them as a series of popup menus, grouped by type.
# Note that render mode "menus" will only be applied in "cell" layouts.
# Indeed, we need to keep the "list" rendering in the "view" layout
# because the "menus" rendering is minimalist and does not allow to
# perform all operations on linked objects (add, move, delete, edit...);
# - "minimal" renders a list of comma-separated, not-even-clickable,
# data about the tied objects (according to shownInfo).
self.render = render
# If render is 'menus', 2 methods must be provided.
# "menuIdMethod" will be called, with every linked object as single arg,
# and must return an ID that identifies the menu into which the object
# will be inserted.
self.menuIdMethod = menuIdMethod
# "menuInfoMethod" will be called with every collected menu ID (from
# calls to the previous method) to get info about this menu. This info
# must be a tuple (text, icon):
# - "text" is the menu name;
# - "icon" (can be None) gives the URL of an icon, if you want to render
# the menu as an icon instead of a text.
self.menuInfoMethod = menuInfoMethod
# "menuUrlMethod" is an optional method that allows to compute an
# alternative URL for the tied object that is shown within the menu.
self.menuUrlMethod = menuUrlMethod
Field.__init__(self, validator, multiplicity, default, show, page,
group, layouts, move, indexed, False,
specificReadPermission, specificWritePermission, width,
height, None, colspan, master, masterValue, focus,
historized, mapping, label, sdefault, scolspan, swidth,
sheight, persist)
self.validable = bool(self.link)
self.checkParameters()
def checkParameters(self):
'''Ensures this Ref is correctly defined.'''
# For forward Refs, "add" and "link" can't both be used.
if not self.isBack and (self.add and self.link):
raise Exception('Parameters "add" and "link" can\'t both be used.')
# If link is "popup", "select" must hold a Search instance.
if (self.link == 'popup') and not isinstance(self.select, Search):
raise Exception('When "link" is "popup", "select" must be a ' \
'appy.fields.search.Search instance.')
def getDefaultLayouts(self):
return {'view': Table('l-f', width='100%'), 'edit': 'lrv-f'}
def isShowable(self, obj, layoutType):
res = Field.isShowable(self, obj, layoutType)
if not res: return res
# We add here specific Ref rules for preventing to show the field under
# some inappropriate circumstances.
if layoutType == 'edit':
if self.mayAdd(obj): return
if self.link in (False, 'list'): return
if self.isBack:
if layoutType == 'edit': return
else: return getattr(obj.aq_base, self.name, None)
return res
def getValue(self, obj, appy=True, noListIfSingleObj=False,
startNumber=None, someObjects=False):
'''Returns the objects linked to p_obj through this Ref field. It
returns Appy wrappers if p_appy is True, the Zope objects else.
* If p_startNumber is None, it returns all referred objects;
* if p_startNumber is a number, it returns self.maxPerPage objects,
starting at p_startNumber.
If p_noListIfSingleObj is True, it returns the single reference as
an object and not as a list.
If p_someObjects is True, it returns an instance of SomeObjects
instead of returning a list of references.'''
uids = getattr(obj.aq_base, self.name, [])
if not uids:
# Maybe is there a default value?
defValue = Field.getValue(self, obj)
if defValue:
if type(defValue) in sutils.sequenceTypes:
uids = [o.o.id for o in defValue]
else:
uids = [defValue.o.id]
# Prepare the result: an instance of SomeObjects, that will be unwrapped
# if not required.
res = gutils.SomeObjects()
res.totalNumber = res.batchSize = len(uids)
batchNeeded = startNumber != None
if batchNeeded:
res.batchSize = self.maxPerPage
if startNumber != None:
res.startNumber = startNumber
# Get the objects given their uids
i = res.startNumber
while i < (res.startNumber + res.batchSize):
if i >= res.totalNumber: break
# Retrieve every reference in the correct format according to p_type
tied = obj.getTool().getObject(uids[i])
if appy: tied = tied.appy()
res.objects.append(tied)
i += 1
# Manage parameter p_noListIfSingleObj
if res.objects and noListIfSingleObj:
if self.multiplicity[1] == 1:
res.objects = res.objects[0]
if someObjects: return res
return res.objects
def getCopyValue(self, obj):
'''Here, as "value ready-to-copy", we return the list of tied object
UIDs, because m_store on the destination object can store tied
objects based on such a list.'''
res = getattr(obj.aq_base, self.name, ())
# Return a copy: it can be dangerous to give the real database value.
if res: return list(res)
def getPossibleValues(self, obj, startNumber=None, someObjects=False,
removeLinked=False):
'''This method returns the list of all objects that can be selected
to be linked as references to p_obj via p_self. It is applicable only
for Ref fields with link!=False. If master values are present in the
request, we use field.masterValues method instead of self.select.
If p_startNumber is a number, it returns self.maxPerPage objects,
starting at p_startNumber. If p_someObjects is True, it returns an
instance of SomeObjects instead of returning a list of objects.
If p_removeLinked is True, we remove, from the result, objects which
are already linked. For example, for Ref fields rendered as a
dropdown menu or a multi-selection box (with link=True), on the edit
page, we need to display all possible values: those that are already
linked appear to be selected in the widget. But for Ref fields
rendered as pick lists (link="list"), once an object is linked, it
must disappear from the "pick list".
'''
req = obj.REQUEST
obj = obj.appy()
paginated = startNumber != None
isSearch = False
if 'masterValues' in req:
# Convert masterValue(s) from id(s) to real object(s).
masterValues = req['masterValues'].strip()
if not masterValues: masterValues = None
else:
masterValues = masterValues.split('*')
tool = obj.tool
if len(masterValues) == 1:
masterValues = tool.getObject(masterValues[0])
else:
masterValues = [tool.getObject(v) for v in masterValues]
objects = self.masterValue(obj, masterValues)
else:
# If this field is an ajax-updatable slave, no need to compute
# possible values: it will be overridden by method self.masterValue
# by a subsequent ajax request (=the "if" statement above).
if self.masterValue and callable(self.masterValue):
objects = []
else:
if not self.select:
# No select method or search has been defined: we must
# retrieve all objects of the referred type that the user
# is allowed to access.
objects = obj.search(self.klass)
else:
if isinstance(self.select, Search):
isSearch = True
maxResults = paginated and self.maxPerPage or 'NO_LIMIT'
start = startNumber or 0
className = obj.tool.o.getPortalType(self.klass)
objects = obj.o.executeQuery(className,
startNumber=start, search=self.select,
maxResults=maxResults)
objects.objects = [o.appy() for o in objects.objects]
else:
objects = self.select(obj)
# Remove already linked objects if required.
if removeLinked:
uids = getattr(obj.o.aq_base, self.name, None)
if uids:
# Browse objects in reverse order and remove linked objects.
if isSearch: objs = objects.objects
else: objs = objects
i = len(objs) - 1
while i >= 0:
if objs[i].id in uids: del objs[i]
i -= 1
# If possible values are not retrieved from a Search, restrict (if
# required) the result to self.maxPerPage starting at p_startNumber.
# Indeed, in this case, unlike m_getValue, we already have all objects
# in "objects": we can't limit objects "waking up" to at most
# self.maxPerPage.
if paginated and not isSearch:
total = len(objects)
objects = objects[startNumber:startNumber + self.maxPerPage]
# Return the result, wrapped in a SomeObjects instance if required.
if not someObjects:
if isSearch: return objects.objects
return objects
if isSearch: return objects
res = gutils.SomeObjects()
res.totalNumber = total
res.batchSize = self.maxPerPage
res.startNumber = startNumber
res.objects = objects
return res
def getLinkedObjectsByMenu(self, obj, objects):
'''This method groups p_objects into sub-lists of objects, grouped by
menu (happens when self.render == 'menus').'''
if not objects: return ()
res = []
# We store in "menuIds" the already encountered menus:
# ~{s_menuId : i_indexInRes}~
menuIds = {}
# Browse every object from p_objects and put them in their menu
# (within "res").
for tied in objects:
menuId = self.menuIdMethod(obj, tied)
if menuId in menuIds:
# We have already encountered this menu.
menuIndex = menuIds[menuId]
res[menuIndex].objects.append(tied)
else:
# A new menu.
menu = Object(id=menuId, objects=[tied])
res.append(menu)
menuIds[menuId] = len(res) - 1
# Complete information about every menu by calling self.menuInfoMethod
for menu in res:
text, icon = self.menuInfoMethod(obj, menu.id)
menu.text = text
menu.icon = icon
return res
def isNumbered(self, obj):
'''Must we show the order number of every tied object?'''
res = self.getAttribute(obj, 'numbered')
if not res: return res
# Returns the column width.
if not isinstance(res, basestring): return '15px'
return res
def getMenuUrl(self, zobj, tied):
'''We must provide the URL of the p_tied object, when shown in a Ref
field in render mode 'menus'. If self.menuUrlMethod is specified,
use it. Else, returns the "normal" URL of the view page for the tied
object, but without any navigation information, because in this
render mode, tied object's order is lost and navigation is
impossible.'''
if self.menuUrlMethod:
return self.menuUrlMethod(zobj.appy(), tied)
return tied.o.getUrl(nav='')
def getStartNumber(self, render, req, ajaxHookId):
'''This method returns the index of the first linked object that must be
shown, or None if all linked objects must be shown at once (it
happens when p_render is "menus").'''
# When using 'menus' render mode, all linked objects must be shown.
if render == 'menus': return
# When using 'list' (=default) render mode, the index of the first
# object to show is in the request.
return int(req.get('%s_startNumber' % ajaxHookId, 0))
def getFormattedValue(self, obj, value, showChanges=False, language=None):
return value
def getIndexType(self): return 'ListIndex'
def getIndexValue(self, obj, forSearch=False):
'''Value for indexing is the list of UIDs of linked objects. If
p_forSearch is True, it will return a list of the linked objects'
titles instead.'''
if not forSearch:
res = getattr(obj.aq_base, self.name, None)
if res:
# The index does not like persistent lists. Moreover, I don't
# want to give to anyone access to the persistent list in the
# DB.
res = list(res)
else:
# Ugly catalog: if I return an empty list, the previous value
# is kept.
res = ['']
return res
else:
# For the global search: return linked objects' titles
return ' '.join([o.getShownValue('title') \
for o in self.getValue(obj, appy=False)])
def hasSortIndex(self):
'''An indexed Ref field is of type "ListIndex", which is not sortable.
So an additional FieldIndex is required.'''
return True
def validateValue(self, obj, value):
if not self.link: return
# We only check "link" Refs because in edit views, "add" Refs are
# not visible. So if we check "add" Refs, on an "edit" view we will
# believe that that there is no referred object even if there is.
# Also ensure that multiplicities are enforced.
if not value:
nbOfRefs = 0
elif isinstance(value, basestring):
nbOfRefs = 1
else:
nbOfRefs = len(value)
minRef = self.multiplicity[0]
maxRef = self.multiplicity[1]
if maxRef == None:
maxRef = sys.maxint
if nbOfRefs < minRef:
return obj.translate('min_ref_violated')
elif nbOfRefs > maxRef:
return obj.translate('max_ref_violated')
def linkObject(self, obj, value, back=False, noSecurity=True,
executeMethods=True):
'''This method links p_value (which can be a list of objects) to p_obj
through this Ref field. When linking 2 objects via a Ref,
p_linkObject must be called twice: once on the forward Ref and once
on the backward ref. p_back indicates if we are calling it on the
forward or backward Ref. If p_noSecurity is True, we bypass security
checks (has the logged user the right to modify this Ref field?).
If p_executeMethods is False, we do not execute methods that
customize the object insertion (parameters insert, beforeLink,
afterLink...). This can be useful while migrating data or duplicating
an object.'''
zobj = obj.o
# Security check
if not noSecurity: zobj.mayEdit(self.writePermission, raiseError=True)
# p_value can be a list of objects
if type(value) in sutils.sequenceTypes:
for v in value:
self.linkObject(obj, v, back, noSecurity, executeMethods)
return
# Gets the list of referred objects (=list of uids), or create it.
refs = getattr(zobj.aq_base, self.name, None)
if refs == None:
refs = zobj.getProductConfig().PersistentList()
setattr(zobj, self.name, refs)
# Insert p_value into it.
uid = value.o.id
if uid in refs: return
# Execute self.beforeLink if present
if executeMethods and self.beforeLink: self.beforeLink(obj, value)
# Where must we insert the object?
if not self.insert or not executeMethods:
refs.append(uid)
elif self.insert == 'start':
refs.insert(0, uid)
elif callable(self.insert):
# It is a method. Use it on every tied object until we find where to
# insert the new object.
tool = zobj.getTool()
insertOrder = self.insert(obj, value)
i = 0
inserted = False
while i < len(refs):
tied = tool.getObject(refs[i], appy=True)
if self.insert(obj, tied) > insertOrder:
refs.insert(i, uid)
inserted = True
break
i += 1
if not inserted: refs.append(uid)
else:
# It is a tuple ('sort', method). Perform a full sort.
refs.append(uid)
tool = zobj.getTool()
# Warning: "refs" is a persistent list whose method "sort" has no
# param "key".
refs.data.sort(key=lambda uid:self.insert[1](obj, \
tool.getObject(uid, appy=True)))
refs._p_changed = 1
# Execute self.afterLink if present
if executeMethods and self.afterLink: self.afterLink(obj, value)
# Update the back reference
if not back:
self.back.linkObject(value, obj, True, noSecurity, executeMethods)
def unlinkObject(self, obj, value, back=False, noSecurity=True,
executeMethods=True):
'''This method unlinks p_value (which can be a list of objects) from
p_obj through this Ref field. For an explanation about parameters
p_back, p_noSecurity and p_executeMethods, check m_linkObject's doc
above.'''
zobj = obj.o
# Security check
if not noSecurity:
zobj.mayEdit(self.writePermission, raiseError=True)
if executeMethods:
self.mayUnlinkElement(obj, value, raiseError=True)
# p_value can be a list of objects
if type(value) in sutils.sequenceTypes:
for v in value:
self.unlinkObject(obj, v, back, noSecurity, executeMethods)
return
refs = getattr(zobj.aq_base, self.name, None)
if not refs: return
# Unlink p_value
uid = value.o.id
if uid in refs:
refs.remove(uid)
# Execute self.afterUnlink if present
if executeMethods and self.afterUnlink: self.afterUnlink(obj, value)
# Update the back reference
if not back:
self.back.unlinkObject(value,obj,True,noSecurity,executeMethods)
def store(self, obj, value):
'''Stores on p_obj, the p_value, which can be:
* None;
* an object UID (=string);
* a list of object UIDs (=list of strings). Generally, UIDs or lists
of UIDs come from Ref fields with link:True edited through the web;
* a Zope object;
* a Appy object;
* a list of Appy or Zope objects.'''
if not self.persist: return
# Standardize p_value into a list of Appy objects
objects = value
if not objects: objects = []
if type(objects) not in sutils.sequenceTypes: objects = [objects]
tool = obj.getTool()
for i in range(len(objects)):
if isinstance(objects[i], basestring):
# We have an UID here
objects[i] = tool.getObject(objects[i], appy=True)
else:
# Be sure to have an Appy object
objects[i] = objects[i].appy()
uids = [o.o.id for o in objects]
appyObj = obj.appy()
# Unlink objects that are not referred anymore
refs = getattr(obj.aq_base, self.name, None)
if refs:
i = len(refs)-1
while i >= 0:
if refs[i] not in uids:
# Object having this UID must unlink p_obj
tied = tool.getObject(refs[i], appy=True)
self.back.unlinkObject(tied, appyObj)
i -= 1
# Link new objects
if objects: self.linkObject(appyObj, objects)
def mayAdd(self, obj, mode='create', checkMayEdit=True):
'''May the user create (if p_mode == "create") or link
(if mode == "link") (a) new referred object(s) from p_obj via this
Ref? If p_checkMayEdit is False, it means that the condition of being
allowed to edit this Ref field has already been checked somewhere
else (it is always required, we just want to avoid checking it
twice).'''
# We can't (yet) do that on back references.
if self.isBack: return gutils.No('is_back')
# Check if this Ref is addable/linkable.
if mode == 'create':
add = self.getAttribute(obj, 'add')
if not add: return gutils.No('no_add')
elif mode == 'link':
if (self.link != 'popup') or not self.isMultiValued(): return
# Have we reached the maximum number of referred elements?
if self.multiplicity[1] != None:
refCount = len(getattr(obj, self.name, ()))
if refCount >= self.multiplicity[1]: return gutils.No('max_reached')
# May the user edit this Ref field?
if checkMayEdit:
if not obj.mayEdit(self.writePermission):
return gutils.No('no_write_perm')
# May the user create instances of the referred class?
if mode == 'create':
if not obj.getTool().userMayCreate(self.klass):
return gutils.No('no_create_perm')
return True
def checkAdd(self, obj):
'''Compute m_mayAdd above, and raise an Unauthorized exception if
m_mayAdd returns False.'''
may = self.mayAdd(obj)
if not may:
obj.raiseUnauthorized("User can't write Ref field '%s' (%s)." % \
(self.name, may.msg))
def getOnAdd(self, q, formName, addConfirmMsg, target, navBaseCall,
startNumber):
'''Computes the JS code to execute when button "add" is clicked.'''
if self.noForm:
# Ajax-refresh the Ref with a special param to link a newly created
# object.
res = navBaseCall.replace('**v**',
"%d,'doCreateWithoutForm'" % startNumber)
if self.addConfirm:
res = "askConfirm('script', %s, %s)" % \
(q(res, False), q(addConfirmMsg))
else:
# In the basic case, no JS code is executed: target.openPopup is
# empty and the button-related form is submitted in the main page.
res = target.openPopup
if self.addConfirm and not target.openPopup:
res = "askConfirm('form','%s',%s)" % (formName,q(addConfirmMsg))
elif self.addConfirm and target.openPopup:
res = "askConfirm('form+script',%s,%s)" % \
(q(formName + '+' + target.openPopup, False), \
q(addConfirmMsg))
return res
def mayUnlinkElement(self, obj, tied, raiseError=False):
'''May we unlink from this Ref field this specific p_tied object?'''
if not self.unlinkElement: return True
res = self.unlinkElement(obj, tied)
if res: return True
else:
if not raiseError: return
# Raise an exception.
obj.o.raiseUnauthorized('field.unlinkElement prevents you to ' \
'unlink this object.')
def getCbJsInit(self, obj):
'''When checkboxes are enabled, this method defines a JS associative
array (named "_appy_objs_cbs") that will store checkboxes' statuses.
This array is needed because all linked objects are not visible at
the same time (pagination).
Moreover, if self.link is "list", an additional array (named
"_appy_poss_cbs") is defined for possible values.
Semantics of this (those) array(s) can be as follows: if a key is
present in it for a given linked object, it means that the
checkbox is unchecked. In this case, all linked objects are selected
by default. But the semantics can be inverted: presence of a key may
mean that the checkbox is checked. The current array semantics is
stored in a variable named "_appy_objs_sem" (or "_appy_poss_sem")
and may hold "unchecked" (initial semantics) or "checked" (inverted
semantics). Inverting semantics allows to keep the array small even
when checking/unchecking all checkboxes.
The mentioned JS arrays and variables are stored as attributes of the
DOM node representing this field.'''
# The initial semantics depends on the checkboxes default value.
default = self.getAttribute(obj, 'checkboxesDefault') and \
'unchecked' or 'checked'
code = "\nnode['_appy_%%s_cbs']={};\nnode['_appy_%%s_sem']='%s';" % \
default
poss = (self.link == 'list') and (code % ('poss', 'poss')) or ''
return "var node=document.getElementById('%s_%s');%s%s" % \
(obj.id, self.name, code % ('objs', 'objs'), poss)
def doChangeOrder(self, obj):
'''Moves a referred object up/down/top/bottom.'''
rq = obj.REQUEST
# How to move the item?
move = rq['move']
# Get the UID of the tied object to move
uid = rq['refObjectUid']
uids = getattr(obj.aq_base, self.name)
oldIndex = uids.index(uid)
if move == 'up':
newIndex = oldIndex - 1
elif move == 'down':
newIndex = oldIndex + 1
elif move == 'top':
newIndex = 0
elif move == 'bottom':
newIndex = len(uids) - 1
elif move.startswith('index'):
# New index starts at 1 (oldIndex starts at 0).
try:
newIndex = int(move.split('_')[1]) - 1
except ValueError:
newIndex = -1
# If newIndex is negative, it means that the move can't occur.
if newIndex > -1:
uids.remove(uid)
uids.insert(newIndex, uid)
def doCreateWithoutForm(self, obj):
'''This method is called when a user wants to create a object from a
reference field, automatically (without displaying a form).'''
obj.appy().create(self.name)
xhtmlToText = re.compile('<.*?>', re.S)
def getReferenceLabel(self, refObject, unlimited=False):
'''p_self must have link=True. I need to display, on an edit view, the
p_refObject in the listbox that will allow the user to choose which
object(s) to link through the Ref. The information to display may
only be the object title or more if self.shownInfo is used.'''
res = ''
for fieldName in self.shownInfo:
refType = refObject.o.getAppyType(fieldName)
value = getattr(refObject, fieldName)
value = refType.getShownValue(refObject.o, value)
if refType.type == 'String':
if refType.format == 2:
value = self.xhtmlToText.sub(' ', value)
elif type(value) in sutils.sequenceTypes:
value = ', '.join(value)
prefix = res and ' | ' or ''
res += prefix + value
if unlimited: return res
maxWidth = self.width or 30
if len(res) > maxWidth:
res = refObject.tool.o.truncateValue(res, maxWidth)
return res
def getIndexOf(self, obj, tiedUid, raiseError=True):
'''Gets the position of tied object identified by p_tiedUid within this
field on p_obj.'''
uids = getattr(obj.aq_base, self.name, None)
if not uids:
if raiseError: raise IndexError()
else: return
if tiedUid in uids:
return uids.index(tiedUid)
else:
if raiseError: raise IndexError()
else: return
def sort(self, obj):
'''Called when the user wants to sort the content of this field.'''
rq = obj.REQUEST
sortKey = rq.get('sortKey')
reverse = rq.get('reverse') == 'True'
obj.appy().sort(self.name, sortKey=sortKey, reverse=reverse)
def getRenderMode(self, layoutType):
'''Gets the render mode, determined by self.render and some
exceptions.'''
if (layoutType == 'view') and (self.render == 'menus'): return 'list'
return self.render
def getPopupObjects(self, obj, rq, requestValue):
'''Gets the list of objects that were selected in the popup (for Ref
fields with link="popup").'''
if requestValue:
# We are validating the form. Return the request value instead of
# the popup value.
tool = obj.tool
if isinstance(requestValue, basestring):
return [tool.getObject(requestValue)]
else:
return [tool.getObject(rv) for rv in requestValue]
res = []
# No object can be selected if the popup has not been opened yet.
if 'semantics' not in rq:
# In this case, display already linked objects if any.
if not obj.isEmpty(self.name): return self.getValue(obj.o)
return res
uids = rq['selected'].split(',')
tool = obj.tool
if rq['semantics'] == 'checked':
# Simply get the selected objects from their uid.
return [tool.getObject(uid) for uid in uids]
else:
# Replay the search in self.select to get the list of uids that were
# shown in the popup.
className = tool.o.getPortalType(self.klass)
brains = obj.o.executeQuery(className, search=self.select,
maxResults='NO_LIMIT', brainsOnly=True,
sortBy=rq.get('sortKey'), sortOrder=rq.get('sortOrder'),
filterKey=rq.get('filterKey'),filterValue=rq.get('filterValue'))
queryUids = [os.path.basename(b.getPath()) for b in brains]
for uid in queryUids:
if uid not in uids:
res.append(tool.getObject(uid))
return res
def onSelectFromPopup(self, obj):
'''This method is called on Ref fields with link="popup", when a user
has selected objects from the popup, to be added to existing tied
objects, from the view widget.'''
obj = obj.appy()
for tied in self.getPopupObjects(obj, obj.request, None):
self.linkObject(obj, tied, noSecurity=False)
def onUiRequest(self, obj, rq):
'''This method is called when an action tied to this Ref field is
triggered from the user interface (link, unlink, link_many,
unlink_many, delete_many).'''
action = rq['linkAction']
tool = obj.getTool()
msg = None
appyObj = obj.appy()
if not action.endswith('_many'):
# "link" or "unlink"
tied = tool.getObject(rq['targetUid'], appy=True)
exec 'self.%sObject(appyObj, tied, noSecurity=False)' % action
else:
# "link_many", "unlink_many", "delete_many". As a preamble, perform
# a security check once, instead of doing it on every object-level
# operation.
obj.mayEdit(self.writePermission, raiseError=True)
# Get the (un-)checked objects from the request.
uids = rq['targetUid'].split(',')
unchecked = rq['semantics'] == 'unchecked'
if action == 'link_many':
# Get possible values (objects)
values = self.getPossibleValues(obj, removeLinked=True)
isObj = True
else:
# Get current values (uids)
values = getattr(obj.aq_base, self.name, ())
isObj = False
# Collect the objects onto which the action must be performed.
targets = []
for value in values:
uid = not isObj and value or value.uid
if unchecked:
# Keep only objects not among uids.
if uid in uids: continue
else:
# Keep only objects being in uids.
if uid not in uids: continue
# Collect this object
target = not isObj and tool.getObject(value, appy=True) or \
value
targets.append(target)
if not targets:
msg = obj.translate('action_null')
else:
# Perform the action on every target. Count the number of failed
# operations.
failed = 0
singleAction = action.split('_')[0]
mustDelete = singleAction == 'delete'
for target in targets:
if mustDelete:
# Delete
if target.o.mayDelete(): target.o.delete()
else: failed += 1
else:
# Link or unlink. For unlinking, we need to perform an
# additional check.
if (singleAction == 'unlink') and \
not self.mayUnlinkElement(appyObj, target):
failed += 1
else:
exec 'self.%sObject(appyObj, target)' % singleAction
if failed:
msg = obj.translate('action_partial', mapping={'nb':failed})
urlBack = obj.getUrl(rq['HTTP_REFERER'])
if not msg: msg = obj.translate('action_done')
appyObj.say(msg)
tool.goto(urlBack)
def getNavInfo(self, obj, nb, total, inPickList=False):
'''Gets the navigation info allowing to navigate from tied object number
p_nb to its siblings.'''
if self.isBack or inPickList: return ''
# If p_nb is None, we want to produce a generic nav info into which we
# will insert a specific number afterwards.
if nb == None: return 'ref.%s.%s.%%d.%d' % (obj.id, self.name, total)
return 'ref.%s.%s.%d.%d' % (obj.id, self.name, nb, total)
def onGotoTied(self, obj):
'''Called when the user wants to go to a tied object whose number is in
the request.'''
number = int(obj.REQUEST['number']) - 1
uids = getattr(obj.aq_base, self.name)
tiedUid = uids[number]
tied = obj.getTool().getObject(tiedUid)
tiedUrl = tied.getUrl(nav=self.getNavInfo(obj, number+1, len(uids)))
return obj.goto(tiedUrl)
def autoref(klass, field):
'''klass.field is a Ref to p_klass. This kind of auto-reference can't be
declared in the "normal" way, like this:
class A:
attr1 = Ref(A)
because at the time Python encounters the static declaration
"attr1 = Ref(A)", class A is not completely defined yet.
This method allows to overcome this problem. You can write such
auto-reference like this:
class A:
attr1 = Ref(None)
autoref(A, A.attr1)
This function can also be used to avoid circular imports between 2
classes from 2 different packages. Imagine class P1 in package p1 has a
Ref to class P2 in package p2; and class P2 has another Ref to p1.P1
(which is not the back Ref of the previous one: it is another,
independent Ref).
In p1, you have
from p2 import P2
class P1:
ref1 = Ref(P2)
Then, if you write the following in p2, python will complain because of a
circular import:
from p1 import P1
class P2:
ref2 = Ref(P1)
The solution is to write this. In p1:
from p2 import P2
class P1:
ref1 = Ref(P2)
autoref(P1, P2.ref2)
And, in p2:
class P2:
ref2 = Ref(None)
'''
field.klass = klass
setattr(klass, field.back.attribute, field.back)
# ------------------------------------------------------------------------------