In Rails, when you create new tables in a non-public schema (i.e., a schema other than the default "public" schema) in PostgreSQL, Rails may not automatically add those new tables to the
schema.rb file. This behavior is due to the way Rails generates the schema file, and it's intended to avoid potential issues with other databases that do not support multiple schemas.
To address this, you can manually include the tables from the non-public schema in the
schema.rb file. Here's how you can do it:
- Manually Include Tables in
schema.rb: Open the
schema.rbfile located in the
dbfolder of your Rails application. You should see the schema definition for your default "public" schema. To include tables from a non-public schema, you can add a custom SQL statement in the
For example, let's say you have a table named "my_table" in a non-public schema named "my_schema." To include it in the
schema.rb, you can add the following line:
# db/schema.rb ActiveRecord::Schema.define(version: 2023_07_19_000000) do # ... existing schema definition ... # Include the table from the non-public schema execute("SET search_path TO my_schema, public;") # Set the schema search path create_table "my_table", force: :cascade do |t| # ... table columns ... end end
execute method is used to set the search path to the non-public schema temporarily and then create the table within that schema. After this, Rails will recognize the table when running database tasks and migrations.
- Running Migrations: If you plan to run database migrations that involve the non-public schema, ensure you set the correct schema search path in your migrations:
# db/migrate/your_migration_file.rb class YourMigration < ActiveRecord::Migration[6.1] def up # Set the schema search path to include the non-public schema execute("SET search_path TO my_schema, public;") # Your migration logic here create_table "my_table", force: :cascade do |t| # ... table columns ... end end def down drop_table "my_table" end end
With this approach, the table and other objects in the non-public schema will be included in the
schema.rb file, and Rails will recognize them properly during database tasks.
Remember that including tables from non-public schemas in the
schema.rb file is specific to PostgreSQL databases. Other databases may not support multiple schemas, so the inclusion of tables from non-default schemas may cause issues with schema management in those databases.
Before proceeding, ensure that including tables from non-public schemas is the appropriate solution for your specific application requirements and database setup.