add graphql endpoint

Gemfile

@@ -12,16 +12,17 @@ gem "rails", "~> 6.1.4"
 gem "sass-rails", ">= 6"
 gem "turbolinks", "~> 5"
 gem "webpacker", "~> 5.0"
-
 gem "bootsnap", ">= 1.4.4", require: false
 
-gem "administrate"
-
 gem "devise"
 gem "devise-bootstrap-views", "~> 1.0"
 gem "devise-i18n"
 
+gem "administrate"
+gem "graphql"
+
 group :development, :test do
+  gem "graphql_playground-rails"
   gem "pry-byebug", platforms: [:mri, :mingw, :x64_mingw]
   gem "capybara"
   gem "rspec-rails"
@@ -32,6 +33,7 @@ group :development, :test do
 end
 
 group :development do
+  gem "graphql_playground-rails"
   gem "web-console", ">= 4.1.0"
 
   gem "listen", "~> 3.3"

Gemfile.lock

@@ -106,6 +106,9 @@ GEM
     ffi (1.15.3)
     globalid (0.5.2)
       activesupport (>= 5.0)
+    graphql (1.12.14)
+    graphql_playground-rails (2.1.0)
+      rails (>= 5.1.0)
     i18n (1.8.10)
       concurrent-ruby (~> 1.0)
     jbuilder (2.11.2)
@@ -299,6 +302,8 @@ DEPENDENCIES
   devise
   devise-bootstrap-views (~> 1.0)
   devise-i18n
+  graphql
+  graphql_playground-rails
   jbuilder (~> 2.7)
   listen (~> 3.3)
   pg (~> 1.1)

app/controllers/graphql_controller.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+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 = prepare_variables(params[:variables])
+    query = params[:query]
+    operation_name = params[:operationName]
+    context = {
+      # Query context goes here, for example:
+      current_user: current_admin_user,
+    }
+    result = XStakeSchema.execute(query, variables: variables, context: context, operation_name: operation_name)
+    render(json: result)
+  rescue StandardError => e
+    raise e unless Rails.env.development?
+    handle_error_in_development(e)
+  end
+
+  private
+
+  # Handle variables in form data, JSON body, or a blank value
+  def prepare_variables(variables_param)
+    case variables_param
+    when String
+      if variables_param.present?
+        JSON.parse(variables_param) || {}
+      else
+        {}
+      end
+    when Hash
+      variables_param
+    when ActionController::Parameters
+      variables_param.to_unsafe_hash # GraphQL-Ruby will validate name and type of incoming variables.
+    when nil
+      {}
+    else
+      raise ArgumentError, "Unexpected parameter: #{variables_param}"
+    end
+  end
+
+  def handle_error_in_development(e)
+    logger.error(e.message)
+    logger.error(e.backtrace.join("\n"))
+
+    render(json: { errors: [{ message: e.message, backtrace: e.backtrace }], data: {} }, status: :internal_server_error)
+  end
+end

app/graphql/mutations/base_mutation.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+module Mutations
+  class BaseMutation < GraphQL::Schema::RelayClassicMutation
+    argument_class Types::BaseArgument
+    field_class Types::BaseField
+    input_object_class Types::BaseInputObject
+    object_class Types::BaseObject
+  end
+end

app/graphql/types/base_argument.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+module Types
+  class BaseArgument < GraphQL::Schema::Argument
+  end
+end

app/graphql/types/base_connection.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Types
+  class BaseConnection < Types::BaseObject
+    # add `nodes` and `pageInfo` fields, as well as `edge_type(...)` and `node_nullable(...)` overrides
+    include GraphQL::Types::Relay::ConnectionBehaviors
+  end
+end

app/graphql/types/base_edge.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Types
+  class BaseEdge < Types::BaseObject
+    # add `node` and `cursor` fields, as well as `node_type(...)` override
+    include GraphQL::Types::Relay::EdgeBehaviors
+  end
+end

app/graphql/types/base_enum.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+module Types
+  class BaseEnum < GraphQL::Schema::Enum
+  end
+end

app/graphql/types/base_field.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+module Types
+  class BaseField < GraphQL::Schema::Field
+    argument_class Types::BaseArgument
+  end
+end

app/graphql/types/base_input_object.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+module Types
+  class BaseInputObject < GraphQL::Schema::InputObject
+    argument_class Types::BaseArgument
+  end
+end

app/graphql/types/base_interface.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+module Types
+  module BaseInterface
+    include GraphQL::Schema::Interface
+    edge_type_class(Types::BaseEdge)
+    connection_type_class(Types::BaseConnection)
+
+    field_class Types::BaseField
+  end
+end

app/graphql/types/base_object.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module Types
+  class BaseObject < GraphQL::Schema::Object
+    edge_type_class(Types::BaseEdge)
+    connection_type_class(Types::BaseConnection)
+    field_class Types::BaseField
+  end
+end

app/graphql/types/base_scalar.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+module Types
+  class BaseScalar < GraphQL::Schema::Scalar
+  end
+end

app/graphql/types/base_union.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Types
+  class BaseUnion < GraphQL::Schema::Union
+    edge_type_class(Types::BaseEdge)
+    connection_type_class(Types::BaseConnection)
+  end
+end

app/graphql/types/mutation_type.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+module Types
+  class MutationType < Types::BaseObject
+    # TODO: remove me
+    field :test_field, String, null: false,
+      description: "An example field added by the generator"
+    def test_field
+      "Hello World"
+    end
+  end
+end

app/graphql/types/node_type.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module Types
+  module NodeType
+    include Types::BaseInterface
+    # Add the `id` field
+    include GraphQL::Types::Relay::NodeBehaviors
+  end
+end

app/graphql/types/query_type.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+module Types
+  class QueryType < Types::BaseObject
+    # Add `node(id: ID!) and `nodes(ids: [ID!]!)`
+    include GraphQL::Types::Relay::HasNodeField
+    include GraphQL::Types::Relay::HasNodesField
+
+    # Add root-level fields here.
+    # They will be entry points for queries on your schema.
+
+    # TODO: remove me
+    field :test_field, String, null: false,
+      description: "An example field added by the generator"
+    def test_field
+      context[:current_user].email
+    end
+  end
+end

app/graphql/x_stake_schema.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+class XStakeSchema < GraphQL::Schema
+  mutation(Types::MutationType)
+  query(Types::QueryType)
+
+  def self.resolve_type(abstract_type, obj, ctx)
+    raise(GraphQL::RequiredImplementationMissingError)
+  end
+
+  def self.id_from_object(object, type_definition, query_ctx)
+    GraphQL::Schema::UniqueWithinType.encode(type_definition.name, object.id)
+  end
+
+  def self.object_from_id(id, query_ctx)
+    type_name, item_id = GraphQL::Schema::UniqueWithinType.decode(id)
+    type_name.constantize.find(item_id)
+  end
+end

config/routes.rb

@@ -1,11 +1,14 @@
 # frozen_string_literal: true
 Rails.application.routes.draw do
+  mount GraphqlPlayground::Rails::Engine, at: "/playground", graphql_path: "/graphql" if Rails.env.development?
+
+  post "/graphql", to: "graphql#execute"
+
+  devise_for :admin_users
+
   namespace :admin do
     resources :admin_users
 
     root to: "admin_users#index"
   end
-
-  devise_for :admin_users
-  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
 end