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Validating Nested Field Test Migration Changes in Rails Admin

This migration test validates the schema modification for nested field test relationships in the Rails Admin application. It specifically tests the change of the field_test_id column to ensure proper foreign key constraints and data integrity.

Test Coverage Overview

The test suite verifies the database migration that modifies the field_test_id column in the nested_field_tests table. Key aspects covered include:

Validation of null constraint enforcement
Integer type specification for the foreign key field
Column modification operation success
Data integrity preservation during migration

Implementation Analysis

The implementation utilizes ActiveRecord’s Migration framework with Rails 5.0 compatibility. The change method employs the change_column operation for schema modification, ensuring reversible migrations and maintaining database consistency.

The test follows the standard Rails migration pattern with explicit column type and constraint specifications.

Technical Details

Testing components include:

ActiveRecord::Migration[5.0] as the base class
change_column method for schema modification
Integer column type specification
Null constraint enforcement
Database-agnostic implementation

Best Practices Demonstrated

The test exemplifies several migration best practices:

Use of explicit null constraints for data integrity
Version-specific migration class inheritance
Clear and focused column modification
Reversible migration implementation
Proper foreign key type specification

railsadminteam/rails_admin

spec/dummy_app/db/migrate/20151027181550_change_field_test_id_to_nested_field_tests.rb

            
# frozen_string_literal: true

class ChangeFieldTestIdToNestedFieldTests < ActiveRecord::Migration[5.0]
  def change
    change_column :nested_field_tests, :field_test_id, :integer, null: false
  end
end