class Create<%= table_name.camelize %> < ActiveRecord::Migration
  def up
    execute %Q{
      CREATE TABLE <%= table_name %> (
      id integer NOT NULL,
      oid oid NOT NULL,
      namespace character varying NOT NULL,
      created_at timestamp without time zone DEFAULT ('now'::text)::timestamp without time zone
      );

      CREATE SEQUENCE <%= table_name %>_id_seq
      START WITH 1
      INCREMENT BY 1
      NO MINVALUE
      NO MAXVALUE
      CACHE 1;

      ALTER SEQUENCE <%= table_name %>_id_seq OWNED BY <%= table_name %>.id;

      ALTER TABLE ONLY <%= table_name %> ALTER COLUMN id SET DEFAULT nextval('<%= table_name %>_id_seq'::regclass);

      ALTER TABLE ONLY <%= table_name %> ADD CONSTRAINT <%= table_name %>_pkey PRIMARY KEY (id);

      CREATE INDEX index_<%= table_name %>_on_namespace ON <%= table_name %> USING btree (namespace);

      CREATE INDEX index_<%= table_name %>_on_oid ON <%= table_name %> USING btree (oid);
    }
  end

  def drop
    drop_table :<%= table_name %>
  end
end


class Create<%= table_name.camelize %> < ActiveRecord::Migration[4.2]
  def up
    execute %Q{
      CREATE TABLE <%= table_name %> (
      id integer NOT NULL,
      oid oid NOT NULL,
      namespace character varying NOT NULL,
      created_at timestamp without time zone DEFAULT ('now'::text)::timestamp without time zone
      );

      CREATE SEQUENCE <%= table_name %>_id_seq
      START WITH 1
      INCREMENT BY 1
      NO MINVALUE
      NO MAXVALUE
      CACHE 1;

      ALTER SEQUENCE <%= table_name %>_id_seq OWNED BY <%= table_name %>.id;

      ALTER TABLE ONLY <%= table_name %> ALTER COLUMN id SET DEFAULT nextval('<%= table_name %>_id_seq'::regclass);

      ALTER TABLE ONLY <%= table_name %> ADD CONSTRAINT <%= table_name %>_pkey PRIMARY KEY (id);

      CREATE INDEX index_<%= table_name %>_on_namespace ON <%= table_name %> USING btree (namespace);

      CREATE INDEX index_<%= table_name %>_on_oid ON <%= table_name %> USING btree (oid);
    }
  end

  def drop
    drop_table :<%= table_name %>
  end
end


Add Rails version number to generated migration
Add Rails version number to generated migration
