Merge pull request #3951 from camptocamp/association_proxy_nullable

Correctly return nillable for relations in md.xsd

c2cgeoportal/lib/dbreflection.py

@@ -70,17 +70,18 @@ class an engine, required for the reflection.
 class _AssociationProxy(object):
     # A specific "association proxy" implementation
 
-    def __init__(self, target, value_attr):
+    def __init__(self, target, value_attr, nullable=True):
         self.target = target
         self.value_attr = value_attr
+        self.nullable = nullable
 
     def __get__(self, obj, type_=None):
         if obj is None:
             # For "hybrid" descriptors that work both at the instance
             # and class levels we could return an SQL expression here.
             # The code of hybrid_property in SQLAlchemy illustrates
             # how to do that.
-            raise AttributeError  # pragma: no cover
+            return self
         target = getattr(obj, self.target)
         return getattr(target, self.value_attr) if target else None
 
@@ -109,8 +110,9 @@ def xsd_sequence_callback(tb, cls):
         target_cls = relationship_property.argument
         query = DBSession.query(getattr(target_cls, p.value_attr))
         attrs = {}
-        attrs["minOccurs"] = str(0)
-        attrs["nillable"] = "true"
+        if p.nullable:
+            attrs["minOccurs"] = str(0)
+            attrs["nillable"] = "true"
         attrs["name"] = k
         with tag(tb, "xsd:element", attrs) as tb:
             with tag(tb, "xsd:simpleType") as tb:
@@ -247,7 +249,12 @@ def _add_association_proxy(cls, col):
                                  lazy="immediate")
     setattr(cls, rel, relationship_)
 
-    setattr(cls, proxy, _AssociationProxy(rel, "name"))
+    nullable = True
+    cls_column_property = getattr(cls, col.name).property
+    for column in cls_column_property.columns:
+        nullable = nullable and column.nullable
+
+    setattr(cls, proxy, _AssociationProxy(rel, "name", nullable=nullable))
 
     if cls.__add_properties__ is None:
         cls.__add_properties__ = [proxy]

c2cgeoportal/tests/functional/test_dbreflection.py

@@ -96,7 +96,8 @@ def _create_table(self, tablename):
             ),
             Column(
                 "child2_id", types.Integer,
-                ForeignKey("public.{0!s}_child.id".format(tablename))
+                ForeignKey("public.{0!s}_child.id".format(tablename)),
+                nullable=False
             ),
             Column("point", Geometry("POINT")),
             Column("linestring", Geometry("LINESTRING")),
@@ -122,7 +123,7 @@ def test_get_class_nonexisting_table(self):
     def test_get_class(self):
         from geoalchemy2 import Geometry
         import c2cgeoportal.lib.dbreflection
-        from c2cgeoportal.lib.dbreflection import get_class
+        from c2cgeoportal.lib.dbreflection import get_class, _AssociationProxy
 
         self._create_table("table_a")
         modelclass = get_class("table_a")
@@ -139,6 +140,11 @@ def test_get_class(self):
         self.assertTrue(isinstance(modelclass.multilinestring.type, Geometry))
         self.assertTrue(isinstance(modelclass.multipolygon.type, Geometry))
 
+        self.assertTrue(isinstance(modelclass.child1, _AssociationProxy))
+        self.assertTrue(modelclass.child1.nullable)
+        self.assertTrue(isinstance(modelclass.child2, _AssociationProxy))
+        self.assertFalse(modelclass.child2.nullable)
+
         # test the Table object
         table = modelclass.__table__
         self.assertTrue("id" in table.c)
@@ -257,7 +263,7 @@ class Parent(Base):
             child1_ = relationship(Child, primaryjoin=(child1_id == Child.id))
             child1 = _AssociationProxy("child1_", "name")
             child2_ = relationship(Child, primaryjoin=(child2_id == Child.id))
-            child2 = _AssociationProxy("child2_", "name")
+            child2 = _AssociationProxy("child2_", "name", nullable=False)
 
         Child.__table__.create()
         Parent.__table__.create()
@@ -295,7 +301,7 @@ def test_xsd_sequence_callback(self):
             '</xsd:restriction>'
             '</xsd:simpleType>'
             '</xsd:element>'
-            '<xsd:element minOccurs="0" name="child2" nillable="true">'
+            '<xsd:element name="child2">'
             '<xsd:simpleType>'
             '<xsd:restriction base="xsd:string">'
             '<xsd:enumeration value="foo" />'