Migrate data to local_authority_application_types table

app/models/application_type.rb

@@ -36,6 +36,9 @@ class ApplicationType < ApplicationRecord
   belongs_to :legislation, optional: true
   has_many :planning_applications, -> { kept }, dependent: :restrict_with_exception
 
+  has_many :local_authority_application_types, dependent: :destroy
+  has_many :local_authorities, through: :local_authority_application_types
+
   accepts_nested_attributes_for :legislation, :document_tags
 
   scope :not_retired, -> { where.not(status: "retired") }

app/models/local_authority.rb

@@ -31,6 +31,9 @@ class LocalAuthority < ApplicationRecord
 
   has_many :neighbour_responses, through: :consultations
 
+  has_many :local_authority_application_types, dependent: :destroy
+  has_many :application_types, through: :local_authority_application_types
+
   with_options presence: true do
     validates :council_code, :subdomain
     validates :short_name, :council_name

app/models/local_authority_application_type.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class LocalAuthorityApplicationType < ApplicationRecord
+  belongs_to :local_authority
+  belongs_to :application_type
+end

db/migrate/20250224104514_migrate_local_authority_application_type.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class MigrateLocalAuthorityApplicationType < ActiveRecord::Migration[7.2]
+  def change
+    PlanningApplication.find_each do |planning_application|
+      LocalAuthorityApplicationType.create!(
+        local_authority_id: planning_application.local_authority_id,
+        application_type_id: planning_application.application_type_id
+      )
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2025_02_24_101659) do
+ActiveRecord::Schema[7.2].define(version: 2025_02_24_104514) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "btree_gin"
   enable_extension "plpgsql"