Fix cache warnings (#338)

geoalchemy2/elements.py

@@ -253,6 +253,8 @@ class CompositeElement(FunctionElement):
     Instances of this class wrap a Postgres composite type.
     """
 
+    inherit_cache = False
+
     def __init__(self, base, field, type_):
         self.name = field
         self.type = to_instance(type_)

geoalchemy2/functions.py

@@ -75,6 +75,9 @@ def __init__(cls, clsname, bases, clsdict):
 
 
 class TableRowElement(ColumnElement):
+
+    inherit_cache = False
+
     def __init__(self, selectable):
         self.selectable = selectable
 
@@ -88,6 +91,7 @@ class ST_AsGeoJSON(with_metaclass(_GenericMeta, functions.GenericFunction)):
     feature version introduced in PostGIS 3."""
 
     name = "ST_AsGeoJSON"
+    inherit_cache = True
 
     def __init__(self, *args, **kwargs):
         expr = kwargs.pop('expr', None)
@@ -197,7 +201,10 @@ def __init__(self, *args, **kwargs):
 
 # Iterate through _FUNCTIONS and create GenericFunction classes dynamically
 for name, type_, doc in _FUNCTIONS:
-    attributes = {'name': name}
+    attributes = {
+        'name': name,
+        'inherit_cache': True,
+    }
     docs = []
 
     if isinstance(doc, tuple):

geoalchemy2/types.py

@@ -131,6 +131,9 @@ class _GISType(UserDefinedType):
     """ This is the way by which spatial operators are defined for
         geometry/geography columns. """
 
+    cache_ok = False
+    """ Disable cache for this type. """
+
     def __init__(self, geometry_type='GEOMETRY', srid=-1, dimension=2,
                  spatial_index=True, use_N_D_index=False, management=False, use_typmod=None,
                  from_text=None, name=None, nullable=True):
@@ -273,6 +276,9 @@ class Geometry(_GISType):
     """ The element class to use. Used by the parent class'
         ``result_processor`` method. """
 
+    cache_ok = False
+    """ Disable cache for this type. """
+
 
 class Geography(_GISType):
     """
@@ -302,6 +308,9 @@ class Geography(_GISType):
     """ The element class to use. Used by the parent class'
         ``result_processor`` method. """
 
+    cache_ok = False
+    """ Disable cache for this type. """
+
 
 class Raster(_GISType):
     """
@@ -344,6 +353,9 @@ class Raster(_GISType):
     """ The element class to use. Used by the parent class'
         ``result_processor`` method. """
 
+    cache_ok = False
+    """ Disable cache for this type. """
+
     def __init__(self, *args, **kwargs):
         # Enforce default values
         kwargs['geometry_type'] = None
@@ -385,6 +397,9 @@ class GeometryDump(CompositeType):
     typemap = {'path': postgresql.ARRAY(Integer), 'geom': Geometry}
     """ Dictionary defining the contents of a ``geometry_dump``. """
 
+    cache_ok = True
+    """ Enable cache for this type. """
+
 
 # Register Geometry, Geography and Raster to SQLAlchemy's Postgres reflection
 # subsystem.
@@ -403,3 +418,6 @@ class SummaryStats(CompositeType):
         'min': Float,
         'max': Float,
     }
+
+    cache_ok = True
+    """ Enable cache for this type. """

tests/gallery/test_summarystatsagg.py

@@ -34,12 +34,16 @@ class SummaryStatsCustomType(CompositeType):
         'max': Float,
     }
 
+    cache_ok = True
+
 
 class ST_SummaryStatsAgg(GenericFunction):
     type = SummaryStatsCustomType
     # Set a specific identifier to not override the actual ST_SummaryStatsAgg function
     identifier = "ST_SummaryStatsAgg_custom"
 
+    inherit_cache = True
+
 
 engine = create_engine('postgresql://gis:gis@localhost/gis', echo=True)
 metadata = MetaData(engine)