alembic: Fix use_callerid_contact option add script.

ASTERISK-28087

Change-Id: I046d018015427d0916fab571b5a4f5367476f729

contrib/ast-db-manage/config/versions/2bb1a85135ad_pjsip_add_use_callerid_contact.py

@@ -24,19 +24,16 @@ AST_BOOL_VALUES = [ '0', '1',
 
 
 def upgrade():
-    # Create the new enum
-    ast_bool_values = ENUM(*AST_BOOL_VALUES, name=AST_BOOL_NAME, create_type=False)
-    if op.get_context().bind.dialect.name == 'postgresql':
-        ast_bool_values.create(op.get_bind(), checkfirst=False)
+    ############################# Enums ##############################
 
+    # ast_bool_values has already been created, so use postgres enum object
+    # type to get around "already created" issue - works okay with mysql
+    ast_bool_values = ENUM(*AST_BOOL_VALUES, name=AST_BOOL_NAME, create_type=False)
 
     op.add_column('ps_globals', sa.Column('use_callerid_contact', ast_bool_values))
 
 
 def downgrade():
     if op.get_context().bind.dialect.name == 'mssql':
-        op.drop_constraint('ck_ps_globals_use_callerid_contact_ast_bool_values','ps_globals')
+        op.drop_constraint('ck_ps_globals_use_callerid_contact_ast_bool_values', 'ps_globals')
     op.drop_column('ps_globals', 'use_callerid_contact')
-
-    if op.get_context().bind.dialect.name == 'postgresql':
-        ENUM(name=AST_BOOL_NAME).drop(op.get_bind(), checkfirst=False)