add habtm between procedures and zones

app/models/procedure.rb

@@ -103,6 +103,7 @@ class Procedure < ApplicationRecord
   belongs_to :replaced_by_procedure, -> { with_discarded }, inverse_of: :replaced_procedures, class_name: "Procedure", optional: true
   belongs_to :service, optional: true
   belongs_to :zone, optional: true
+  has_and_belongs_to_many :zones
 
   def active_dossier_submitted_message
     published_dossier_submitted_message || draft_dossier_submitted_message

app/models/zone.rb

@@ -11,7 +11,7 @@
 class Zone < ApplicationRecord
   validates :acronym, presence: true, uniqueness: true
   has_many :labels, -> { order(designated_on: :desc) }, class_name: 'ZoneLabel', inverse_of: :zone
-  has_many :procedures, -> { order(published_at: :desc) }, inverse_of: :zone
+  has_and_belongs_to_many :procedures, -> { order(published_at: :desc) }, inverse_of: :zone
 
   def current_label
     labels.first.name

db/migrate/20221006190110_create_procedures_and_zones.rb

@@ -0,0 +1,10 @@
+class CreateProceduresAndZones < ActiveRecord::Migration[6.1]
+  def change
+    create_table :procedures_zones, id: false do |t|
+      t.belongs_to :procedure
+      t.belongs_to :zone
+
+      t.timestamps
+    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.define(version: 2022_10_05_145646) do
+ActiveRecord::Schema.define(version: 2022_10_06_190110) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
@@ -685,6 +685,15 @@ ActiveRecord::Schema.define(version: 2022_10_05_145646) do
     t.index ["zone_id"], name: "index_procedures_on_zone_id"
   end
 
+  create_table "procedures_zones", id: false, force: :cascade do |t|
+    t.datetime "created_at", precision: 6, null: false
+    t.bigint "procedure_id"
+    t.datetime "updated_at", precision: 6, null: false
+    t.bigint "zone_id"
+    t.index ["procedure_id"], name: "index_procedures_zones_on_procedure_id"
+    t.index ["zone_id"], name: "index_procedures_zones_on_zone_id"
+  end
+
   create_table "received_mails", id: :serial, force: :cascade do |t|
     t.text "body"
     t.datetime "created_at", null: false