lib/strong_migrations/checks.rb in strong_migrations-1.3.2 vs lib/strong_migrations/checks.rb in strong_migrations-1.4.0

@@ -71,10 +71,18 @@
         raise_error :add_column_json,
           command: command_str("add_column", [table, column, :jsonb, options])
       end
     end
 
+    def check_add_exclusion_constraint(*args)
+      table = args[0]
+
+      unless new_table?(table)
+        raise_error :add_exclusion_constraint
+      end
+    end
+
     # unlike add_index, we don't make an exception here for new tables
     #
     # with add_index, it's fine to lock a new table even after inserting data
     # since the table won't be in use by the application
     #
@@ -168,10 +176,11 @@
     def check_change_column(*args)
       options = args.extract_options!
       table, column, type = args
 
       safe = false
-      existing_column = connection.columns(table).find { |c| c.name.to_s == column.to_s }
+      table_columns = connection.columns(table) rescue []
+      existing_column = table_columns.find { |c| c.name.to_s == column.to_s }
       if existing_column
         existing_type = existing_column.sql_type.sub(/\(\d+(,\d+)?\)/, "")
         safe = adapter.change_type_safe?(table, column, type, options, existing_column, existing_type)
       end