Ensure graphiql loads

- Fix manifest per: rmosolgo/graphiql-rails#75
- Nest graphql_controller in Api module
- Clean up routes

app/assets/config/manifest.js

@@ -1,2 +1,4 @@
 //= link_tree ../images
 //= link_directory ../stylesheets .css
+//= link graphiql/rails/application.css
+//= link graphiql/rails/application.js

app/controllers/api/graphql_controller.rb

@@ -0,0 +1,50 @@
+module Api
+  class GraphqlController < ApplicationController
+    # If accessing from outside this domain, nullify the session
+    # This allows for outside API access while preventing CSRF attacks,
+    # but you'll have to authenticate your user separately
+    # protect_from_forgery with: :null_session
+
+    def execute
+      variables = ensure_hash(params[:variables])
+      query = params[:query]
+      operation_name = params[:operationName]
+      context = {
+        # Query context goes here, for example:
+        # current_user: current_user,
+      }
+      result = IdeaBoardSchema.execute(query, variables: variables, context: context, operation_name: operation_name)
+      render json: result
+    rescue => e
+      raise e unless Rails.env.development?
+      handle_error_in_development e
+    end
+
+    private
+
+    # Handle form data, JSON body, or a blank value
+    def ensure_hash(ambiguous_param)
+      case ambiguous_param
+      when String
+        if ambiguous_param.present?
+          ensure_hash(JSON.parse(ambiguous_param))
+        else
+          {}
+        end
+      when Hash, ActionController::Parameters
+        ambiguous_param
+      when nil
+        {}
+      else
+        raise ArgumentError, "Unexpected parameter: #{ambiguous_param}"
+      end
+    end
+
+    def handle_error_in_development(e)
+      logger.error e.message
+      logger.error e.backtrace.join("\n")
+
+      render json: { error: { message: e.message, backtrace: e.backtrace }, data: {} }, status: 500
+    end
+  end
+end

config/routes.rb

@@ -1,10 +1,11 @@
 Rails.application.routes.draw do
   if Rails.env.development?
-    mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/graphql"
+    mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/api/graphql"
   end
-  post "/graphql", to: "graphql#execute"
+
   namespace :api do
     resources :tokens, only: :create
+    post "/graphql", to: "graphql#execute"
   end
 
   get "*path", to: 'client#index'