added cascading delete to models

app/models/organisation.rb

@@ -1,11 +1,11 @@
 class Organisation < ApplicationRecord
-  has_many :users
-  has_many :owned_case_logs, class_name: "CaseLog", foreign_key: "owning_organisation_id"
-  has_many :managed_case_logs, class_name: "CaseLog", foreign_key: "managing_organisation_id"
+  has_many :users, dependent: :destroy
+  has_many :owned_case_logs, class_name: "CaseLog", foreign_key: "owning_organisation_id", dependent: :destroy
+  has_many :managed_case_logs, class_name: "CaseLog", foreign_key: "managing_organisation_id", dependent: :destroy
   has_many :data_protection_confirmations
   has_many :organisation_rent_periods
-  has_many :owned_schemes, class_name: "Scheme", foreign_key: "stock_owning_organisation_id"
-  has_many :managed_schemes, class_name: "Scheme"
+  has_many :owned_schemes, class_name: "Scheme", foreign_key: "stock_owning_organisation_id", dependent: :destroy
+  has_many :managed_schemes, class_name: "Scheme", dependent: :destroy
 
   scope :search_by_name, ->(name) { where("name ILIKE ?", "%#{name}%") }
   scope :search_by, ->(param) { search_by_name(param) }

db/migrate/20220707125124_add_foreign_key_to_user_organisation.rb

@@ -0,0 +1,7 @@
+class AddForeignKeyToUserOrganisation < ActiveRecord::Migration[7.0]
+ 
+  def change
+    add_reference :organisations, :users, foreign_key: true, on_delete: :cascade
+  end
+end
+

db/migrate/20220707133909_add_foreign_key_to_logs_organisation.rb

@@ -0,0 +1,6 @@
+class AddForeignKeyToLogsOrganisation < ActiveRecord::Migration[7.0]
+  
+  def change
+    add_reference :organisations, :case_logs, foreign_key: true, on_delete: :cascade
+  end
+end

db/migrate/20220707134232_add_relationships_for_organization.rb

@@ -0,0 +1,20 @@
+class AddRelationshipsForOrganization < ActiveRecord::Migration[7.0]
+
+  class Organisation < ApplicationRecord
+    has_many :users, dependent: :destroy
+    has_many :case_logs, dependent: :destroy
+    has_many :schemes, dependent: :destroy
+  end
+  
+  class User < ApplicationRecord
+    belongs_to :organization
+  end
+  
+  class CaseLog < ApplicationRecord
+    belongs_to :organization
+  end
+  
+  class CaseLog < ApplicationRecord
+    belongs_to :organization
+  end
+end