[gen] Added wrapper.createFrom, similar to wrapper.create, but allows to create an object with data from another object (kind of 'duplicate' functionality).

fields/__init__.py

@@ -533,6 +533,11 @@ class Field:
                 return self.default
         return value
 
+    def getCopyValue(self, obj):
+        '''Gets the value of this field on p_obj as with m_getValue above. But
+           if this value is mutable, get a copy of it.'''
+        return self.getValue(obj)
+
     def getFormattedValue(self, obj, value, showChanges=False, language=None):
         '''p_value is a real p_obj(ect) value from a field from this type. This
            method returns a pretty, string-formatted version, for displaying

fields/file.py

@@ -331,6 +331,7 @@ class File(Field):
         name = requestName or self.name
         return obj.REQUEST.get('%s_file' % name)
 
+    def getCopyValue(self, obj): raise Exception('Not implemented yet.')
     def getDefaultLayouts(self): return {'view':'l-f','edit':'lrv-f'}
 
     def isEmptyValue(self, obj, value):

fields/ref.py

@@ -786,6 +786,14 @@ class Ref(Field):
         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

fields/string.py

@@ -155,6 +155,7 @@ class String(Field):
              multilingual=len(languages) > 1;
              mLayout=multilingual and field.getLanguagesLayout('view');
              mayAjaxEdit=not showChanges and field.inlineEdit and \
+                         (layoutType != 'cell') and \
                          zobj.mayEdit(field.writePermission)">
       <x if="field.isSelect">
        <span if="not value" class="smaller">-</span>
@@ -518,6 +519,13 @@ class String(Field):
             value = list(value)
         return value
 
+    def getCopyValue(self, obj):
+        '''If the value is mutable (ie, a dict for a multilingual field), return
+           a copy of it instead of the value stored in the database.'''
+        res = self.getValue(obj)
+        if isinstance(res, dict): res = res.copy()
+        return res
+
     def valueIsInRequest(self, obj, request, name):
         languages = self.getAttribute(obj, 'languages')
         if len(languages) == 1: