Add support for integer search filters.

This mostly just avoids to suppress type errors by stripping out
non-numeric chars from input.

tailbone/grids/search.py

@@ -26,6 +26,8 @@ Grid Search Filters
 
 from __future__ import unicode_literals
 
+import re
+
 from sqlalchemy import func, or_
 
 from webhelpers.html import tags
@@ -181,6 +183,23 @@ def filter_ilike(field):
     return {'lk': ilike, 'nl': not_ilike}
 
 
+def filter_int(field):
+    """
+    Returns a filter map entry for an integer field.  This provides exact
+    matching but also strips out non-numeric characters to avoid type errors.
+    """
+
+    def filter_is(q, v):
+        v = re.sub(r'\D', '', v or '')
+        return q.filter(field == int(v)) if v else q
+
+    def filter_nt(q, v):
+        v = re.sub(r'\D', '', v or '')
+        return q.filter(field != int(v)) if v else q
+
+    return {'is': filter_is, 'nt': filter_nt}
+
+
 def filter_soundex(field):
     """
     Returns a filter map entry which leverages the `soundex()` SQL function.
@@ -256,7 +275,7 @@ def get_filter_config(prefix, request, filter_map, **kwargs):
     return config
 
 
-def get_filter_map(cls, exact=[], ilike=[], **kwargs):
+def get_filter_map(cls, exact=[], ilike=[], int_=[], **kwargs):
     """
     Convenience function which returns a "filter map" for ``cls``.
 
@@ -266,6 +285,9 @@ def get_filter_map(cls, exact=[], ilike=[], **kwargs):
     ``ilike``, if provided, should be a list of field names for which "ILIKE"
     filtering is to be allowed.
 
+    ``int_``, if provided, should be a list of field names for which "integer"
+    filtering is to be allowed.
+
     Any remaining ``kwargs`` are assumed to be filter map entries themselves,
     and are added directly to the map.
     """
@@ -275,6 +297,8 @@ def get_filter_map(cls, exact=[], ilike=[], **kwargs):
         fmap[name] = filter_exact(getattr(cls, name))
     for name in ilike:
         fmap[name] = filter_ilike(getattr(cls, name))
+    for name in int_:
+        fmap[name] = filter_int(getattr(cls, name))
     fmap.update(kwargs)
     return fmap
 

tailbone/views/grids/alchemy.py

@@ -138,6 +138,9 @@ class SearchableAlchemyGridView(PagedAlchemyGridView):
     def filter_ilike(self, field):
         return grids.search.filter_ilike(field)
 
+    def filter_int(self, field):
+        return grids.search.filter_int(field)
+
     def filter_soundex(self, field):
         return grids.search.filter_soundex(field)