Add HSTORE to render_type_w_subtype

Fixed the autogenerate of the module prefix
when rendering the text_type parameter of
postgresql.HSTORE, in much the same way that
we do for ARRAY's type and JSON's text_type.

Change-Id: Ie8c2cdd1f4aeebcbb306c7f74168f8ac33688b1a
Fixes: sqlalchemy#480

alembic/ddl/postgresql.py

@@ -199,6 +199,11 @@ def render_type(self, type_, autogen_context):
 
         return False
 
+    def _render_HSTORE_type(self, type_, autogen_context):
+        return render._render_type_w_subtype(
+            type_, autogen_context, 'text_type', r'(.+?\(.*text_type=)'
+        )
+
     def _render_ARRAY_type(self, type_, autogen_context):
         return render._render_type_w_subtype(
             type_, autogen_context, 'item_type', r'(.+?\()'

docs/build/unreleased/480.rst

@@ -0,0 +1,8 @@
+.. change::
+    :tags: bug, postgresql
+    :tickets: 480
+
+    Fixed the autogenerate of the module prefix
+    when rendering the text_type parameter of
+    postgresql.HSTORE, in much the same way that
+    we do for ARRAY's type and JSON's text_type.

tests/test_postgresql.py

@@ -32,7 +32,7 @@
 
 
 if util.sqla_09:
-    from sqlalchemy.dialects.postgresql import JSON, JSONB
+    from sqlalchemy.dialects.postgresql import JSON, JSONB, HSTORE
 
 
 class PostgresqlOpTest(TestBase):
@@ -693,6 +693,29 @@ def test_postgresql_array_type(self):
         assert 'from sqlalchemy.dialects import postgresql' in \
             self.autogen_context.imports
 
+    @config.requirements.sqlalchemy_110
+    def test_postgresql_hstore_subtypes(self):
+        eq_ignore_whitespace(
+            autogenerate.render._repr_type(
+                HSTORE(), self.autogen_context),
+            "postgresql.HSTORE(text_type=sa.Text())"
+        )
+
+        eq_ignore_whitespace(
+            autogenerate.render._repr_type(
+                HSTORE(text_type=String()), self.autogen_context),
+            "postgresql.HSTORE(text_type=sa.String())"
+        )
+
+        eq_ignore_whitespace(
+            autogenerate.render._repr_type(
+                HSTORE(text_type=BYTEA()), self.autogen_context),
+            "postgresql.HSTORE(text_type=postgresql.BYTEA())"
+        )
+
+        assert 'from sqlalchemy.dialects import postgresql' in \
+            self.autogen_context.imports
+
     @config.requirements.sqlalchemy_110
     def test_generic_array_type(self):