Add Film Mutation

Author: xuorig

app/controllers/graphql_controller.rb

@@ -4,9 +4,7 @@ class GraphqlController < ApplicationController
   def execute
     query_string = params[:query].to_s
     variables = ensure_hash(params[:variables])
-    context = {
-      user: @user
-    }
+    context = { user: @user }
 
     result = Graph::Schema.execute(query_string, variables: variables, context: context)
     render json: result

app/models/graph/mutations/.keep

@@ -0,0 +1,36 @@
+module Graph
+  module Mutations
+    FilmRate = GraphQL::Relay::Mutation.define do
+      name "FilmRate"
+
+      input_field :filmId, !types.ID
+      input_field :rating, !types.Int
+
+      return_field :film, Graph::Types::Film
+
+      resolve ->(_, input, ctx) do
+        # TODO auth error
+        return unless user = ctx[:user]
+
+        # TODO user error
+        return unless film = Film.find_by(id: input["filmId"])
+
+        rating = user.ratings.build(
+          film: film,
+          rating: input["rating"]
+        )
+
+        if rating.save
+          {
+            film: film
+          }
+        else
+          # TODO add user errors
+          {
+            film: film
+          }
+        end
+      end
+    end
+  end
+end

app/models/graph/mutations/film_rate.rb

@@ -0,0 +1,8 @@
+module Graph
+  module Mutations
+    Mutation = GraphQL::ObjectType.define do
+      name "Mutation"
+      field :filmRate, field: Graph::Mutations::FilmRate.field
+    end
+  end
+end

app/models/graph/mutations/mutation.rb

@@ -1,6 +1,7 @@
 module Graph
   Schema = GraphQL::Schema.define do
     query Graph::Types::Query
+    mutation Graph::Mutations::Mutation
 
     resolve_type ->(obj, ctx) do
       Graph::Schema.types.values.find { |type| type.name == obj.class.name }