schema_plus buggy migration

gistfile1.txt

class Migration < ActiveRecord::Migration
  def change
    SchemaPlus.setup do |config|
      config.foreign_keys.auto_create = false
    end

    create_table :period_types, force: true do |t|
      t.string  :name
    end

    create_table :grade_systems, force: true do |t|
      t.string   :name
      t.integer  :school_id
      t.integer  :parent_id
      t.integer  :profile_id
    end

    create_table :schools, force: true do |t|
      t.string   :name
      t.integer  :default_grade_system_id
    end


    create_table :academic_years, force: true do |t|
      t.string  :name
      t.integer :school_id
      t.integer :period_type_id
    end

    create_table :buildings, force: true do |t|
      t.string   :name
      t.integer  :school_id
    end

    create_table :publishing_houses, force: true do |t|
      t.string   :name
    end

    create_table :profiles, force: true do |t|
      t.integer  :school_id
      t.integer  :publishing_house_id
      t.integer  :building_id
    end

    create_table :class_units, force: true do |t|
      t.string   :name
      t.integer  :school_id
      t.integer  :mentor_id
      t.integer  :building_id
    end

    ActiveRecord::Base.connection.add_foreign_key(School.table_name, :default_grade_system_id, GradeSystem.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(GradeSystem.table_name, :school_id, School.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(GradeSystem.table_name, :parent_id, GradeSystem.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(GradeSystem.table_name, :profile_id, Profile.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(Profile.table_name, :building_id, Building.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(Profile.table_name, :school_id, School.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(ClassUnit.table_name, :school_id, School.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(ClassUnit.table_name, :building_id, Building.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(ClassUnit.table_name, :mentor_id, Profile.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(Building.table_name, :school_id, School.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(AcademicYear.table_name, :school_id, School.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(AcademicYear.table_name, :period_type_id, PeriodType.table_name, :id)
    ActiveRecord::Base.connection.add_foreign_key(Profile.table_name, :publishing_house_id, PublishingHouse.table_name, :id)
  end
end