Return proper REST response for deleting a party for more endpoints

app/controllers/api/v1/favorites_controller.rb

@@ -31,10 +31,15 @@ module Api
         raise Api::V1::UnauthorizedError unless current_user
 
         @favorite = Favorite.where(user_id: current_user.id, party_id: favorite_params[:party_id]).first
-        render_not_found_response('favorite') unless @favorite
+        return render_not_found_response('favorite') unless @favorite
 
-        render_error("Couldn't delete favorite") unless Favorite.destroy(@favorite.id)
+        if Favorite.destroy(@favorite.id)
           render json: FavoriteBlueprint.render(@favorite, root: :favorite, view: :destroyed)
+        else
+          render_unprocessable_entity_response(
+            Api::V1::GranblueError.new("Couldn't delete favorite")
+          )
+        end
       end
 
       private

app/controllers/api/v1/grid_characters_controller.rb

@@ -228,7 +228,13 @@ module Api
 
         return render_not_found_response('grid_character') if grid_character.nil?
 
-        render json: GridCharacterBlueprint.render(grid_character, view: :destroyed) if grid_character.destroy
+        if grid_character.destroy
+          render json: GridCharacterBlueprint.render(grid_character, view: :destroyed)
+        else
+          render_unprocessable_entity_response(
+            Api::V1::GranblueError.new(grid_character.errors.full_messages.join(', '))
+          )
+        end
       end
 
       private

app/controllers/api/v1/grid_summons_controller.rb

@@ -220,7 +220,13 @@ module Api
 
         return render_not_found_response('grid_summon') if grid_summon.nil?
 
-        render json: GridSummonBlueprint.render(grid_summon, view: :destroyed), status: :ok if grid_summon.destroy
+        if grid_summon.destroy
+          render json: GridSummonBlueprint.render(grid_summon, view: :destroyed), status: :ok
+        else
+          render_unprocessable_entity_response(
+            Api::V1::GranblueError.new(grid_summon.errors.full_messages.join(', '))
+          )
+        end
       end
 
       ##

app/controllers/api/v1/grid_weapons_controller.rb

@@ -212,7 +212,13 @@ module Api
 
         return render_not_found_response('grid_weapon') if grid_weapon.nil?
 
-        render json: GridWeaponBlueprint.render(grid_weapon, view: :destroyed), status: :ok if grid_weapon.destroy
+        if grid_weapon.destroy
+          render json: GridWeaponBlueprint.render(grid_weapon, view: :destroyed), status: :ok
+        else
+          render_unprocessable_entity_response(
+            Api::V1::GranblueError.new(grid_weapon.errors.full_messages.join(', '))
+          )
+        end
       end
 
       private

app/controllers/api/v1/parties_controller.rb

@@ -81,7 +81,13 @@ module Api
 
       # Deletes a party.
       def destroy
-        head :no_content if @party.destroy
+        if @party.destroy
+          head :no_content
+        else
+          render_unprocessable_entity_response(
+            Api::V1::PartyDeletionFailedError.new(@party.errors.full_messages)
+          )
+        end
       end
 
       # Extended Party Actions

app/controllers/concerns/party_authorization_concern.rb

@@ -5,6 +5,8 @@ module PartyAuthorizationConcern
 
   # Checks whether the current user (or provided edit key) is authorized to modify @party.
   def authorize_party!
+    return render_not_found_response('party') unless @party
+
     if @party.user.present?
       render_unauthorized_response unless current_user.present? && @party.user == current_user
     else

app/errors/api/v1/party_deletion_failed_error.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class PartyDeletionFailedError < StandardError
+      attr_reader :errors
+
+      def initialize(errors = [])
+        @errors = errors
+        super(message)
+      end
+
+      def http_status
+        422
+      end
+
+      def code
+        'party_deletion_failed'
+      end
+
+      def message
+        if @errors.any?
+          "Failed to delete party: #{@errors.join(', ')}"
+        else
+          'Failed to delete party due to an unknown error'
+        end
+      end
+
+      def to_hash
+        {
+          message: message,
+          code: code,
+          errors: @errors
+        }
+      end
+    end
+  end
+end

app/models/party.rb

@@ -140,22 +140,19 @@ class Party < ApplicationRecord
   has_many :characters,
            foreign_key: 'party_id',
            class_name: 'GridCharacter',
-           counter_cache: true,
+           dependent: :delete_all,
-           dependent: :destroy,
            inverse_of: :party
 
   has_many :weapons,
            foreign_key: 'party_id',
            class_name: 'GridWeapon',
-           counter_cache: true,
+           dependent: :delete_all,
-           dependent: :destroy,
            inverse_of: :party
 
   has_many :summons,
            foreign_key: 'party_id',
            class_name: 'GridSummon',
-           counter_cache: true,
+           dependent: :delete_all,
-           dependent: :destroy,
            inverse_of: :party
 
   has_many :favorites, dependent: :destroy