Add custom errors

app/controllers/api/v1/api_controller.rb

@@ -1,4 +1,5 @@
-class Api::V1::ApiController < ActionController::API
+module Api::V1
+    class ApiController < ActionController::API
     ##### Doorkeeper
         include Doorkeeper::Rails::Helpers
 
@@ -8,6 +9,9 @@ class Api::V1::ApiController < ActionController::API
         rescue_from ActiveRecord::RecordNotFound, with: :render_not_found_response
         rescue_from ActiveRecord::RecordNotSaved, with: :render_unprocessable_entity_response
         rescue_from ActiveRecord::RecordNotUnique, with: :render_unprocessable_entity_response
+        rescue_from Api::V1::SameFavoriteUserError, with: :render_unprocessable_entity_response
+        rescue_from Api::V1::FavoriteAlreadyExistsError, with: :render_unprocessable_entity_response
+        rescue_from Api::V1::UnauthorizedError, with: :render_unauthorized_response
         rescue_from ActionController::ParameterMissing, with: :render_unprocessable_entity_response
 
     ##### Hooks
@@ -66,3 +70,4 @@ class Api::V1::ApiController < ActionController::API
             raise UnauthorizedError unless current_user
         end
     end
+end

app/errors/api/v1/FavoriteAlreadyExistsError.rb

@@ -0,0 +1,22 @@
+module Api::V1
+    class FavoriteAlreadyExistsError < StandardError
+        def http_status
+            422
+        end
+
+        def code
+            "favorite_already_exists"
+        end
+
+        def message
+            "This user has favorited this party already"
+        end
+
+        def to_hash
+            {
+                message: message,
+                code: code
+            }
+        end
+    end
+end

app/errors/api/v1/SameFavoriteUserError.rb

@@ -0,0 +1,22 @@
+module Api::V1
+    class SameFavoriteUserError < StandardError
+        def http_status
+            422
+        end
+
+        def code
+            "same_favorite_user"
+        end
+
+        def message
+            "Users cannot favorite their own parties"
+        end
+
+        def to_hash
+            {
+                message: message,
+                code: code
+            }
+        end
+    end
+end

app/errors/api/v1/UnauthorizedError.rb

@@ -0,0 +1,22 @@
+module Api::V1
+    class UnauthorizedError < StandardError
+        def http_status
+            401
+        end
+
+        def code
+            "unauthorized"
+        end
+
+        def message
+            "User is not allowed to modify that resource"
+        end
+
+        def to_hash
+            {
+                message: message,
+                code: code
+            }
+        end
+    end
+end