Also support text

Only works on latest head, but we only check for 2.0

diff --git a/alembic/ddl/postgresql.py b/alembic/ddl/postgresql.py
index 877338b6c1ebdcb35071f78a12b00f171a9dddf6..f5f33b7ebd778dc07546ae875932946e00644805 100644 (file)
--- a/alembic/ddl/postgresql.py
+++ b/alembic/ddl/postgresql.py
@@ -22,6 +22,7 @@ from sqlalchemy.dialects.postgresql import ExcludeConstraint
 from sqlalchemy.dialects.postgresql import INTEGER
 from sqlalchemy.schema import CreateIndex
 from sqlalchemy.sql.elements import ColumnClause
+from sqlalchemy.sql.elements import TextClause
 from sqlalchemy.types import NULLTYPE
 
 from .base import alter_column
@@ -667,11 +668,11 @@ def _exclude_constraint(
 
 
 def _render_potential_column(
-    value: Union[ColumnClause, Column], autogen_context: AutogenContext
+    value: Union[ColumnClause, Column, TextClause], autogen_context: AutogenContext
 ) -> str:
     if isinstance(value, ColumnClause):
         if value.is_literal:
-            # Support stuff like literal_column("int8range(from, to)") in ExcludeConstraint
+            # like literal_column("int8range(from, to)") in ExcludeConstraint
             template = "%(prefix)sliteral_column(%(name)r)"
         else:
             template = "%(prefix)scolumn(%(name)r)"
@@ -680,7 +681,12 @@ def _render_potential_column(
             "prefix": render._sqlalchemy_autogenerate_prefix(autogen_context),
             "name": value.name,
         }
-
+    elif isinstance(value, TextClause):
+        template = "%(prefix)stext(%(text)r)"
+        return template % {
+            "prefix": render._sqlalchemy_autogenerate_prefix(autogen_context),
+            "text": value.text,
+        }
     else:
         return render._render_potential_expr(
             value, autogen_context, wrap_in_text=False

diff --git a/tests/test_postgresql.py b/tests/test_postgresql.py
index 8e901c55c93f451a42c385b65755eaf5856d5cb2..25d4c3a1d3b78f8f7805b296a043182c618d2e06 100644 (file)
--- a/tests/test_postgresql.py
+++ b/tests/test_postgresql.py
@@ -1182,6 +1182,36 @@ class PostgresqlAutogenRenderTest(TestBase):
             "name='TExclID'))",
         )
 
+    @config.requirements.sqlalchemy_2
+    def test_inline_exclude_constraint_text(self):
+        # Actually, this only works on sqlalchemy 2.x >= 2023-03-03 due to a bug in sqlalchemy
+        # See https://github.com/sqlalchemy/alembic/issues/1184
+        #     and https://github.com/sqlalchemy/sqlalchemy/issues/9401
+
+        from sqlalchemy.dialects.postgresql import ExcludeConstraint
+
+        autogen_context = self.autogen_context
+
+        m = MetaData()
+        t = Table(
+            "TTable", m, Column("id", String()),
+            ExcludeConstraint(
+                (text("id + 2"), "="), name="TExclID", using="gist"
+            ),
+        )
+
+        op_obj = ops.CreateTableOp.from_table(t)
+
+        eq_ignore_whitespace(
+            autogenerate.render_op_text(autogen_context, op_obj),
+            "op.create_table('TTable',sa.Column('id', sa.String(), "
+            "nullable=True),"
+            "postgresql.ExcludeConstraint((sa.text('id + 2'), '='), "
+            "using='gist', "
+            "name='TExclID'))",
+        )
+
+
     def test_json_type(self):
         eq_ignore_whitespace(
             autogenerate.render._repr_type(JSON(), self.autogen_context),