harigopal

# A tiny RSpec helper 
#
# spec/support/helpers/let_env.rb
module LetEnv
  def let_env(name)
    around do |example|
      @original_environment_vars ||= {}
      @original_environment_vars[name] ||= ENV[name.to_s]

      ENV[name.to_s] = yield

harigopal

# app/graphql/my_rails_app_schema.rb
class MyRailsAppSchema < GraphQL::Schema
  mutation(Types::MutationType)
  query(Types::QueryType)
end

# app/graphql/types/query_type.rb
module Types
  class QueryType < Types::BaseObject
    # Add root-level fields here. They will be entry points for queries on your schema.

harigopal

# config/routes.rb
if Rails.env.development?
  mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/graphql"
end

post "/graphql", to: "graphql#execute"

# app/controllers/graphql_controller.rb
class GraphqlController < ApplicationController
  def execute

harigopal

# app/graphql/mutations/update_post.rb
module Mutations
  class UpdatePost < GraphQL::Schema::Mutation
    argument :post_id, ID, required: true
    argument :description, String, required: true
  
    description "Create a new post in a team"

    field :post, Types::UpdatedPostType, null: true
    field :errors, [String], null: false

harigopal

# app/queries/create_comment_mutator.rb
class CreateCommentMutator < ApplicationQuery
  property :post_id
  property :comment, validates: { length: { minimum: 1, maximum: 500 } }

  validate :post_belongs_to_team

  def post_belongs_to_team
    return if post.present?

harigopal

# app/graphql/mutations/create_comment.rb
module Mutations
  class CreateComment < GraphQL::Schema::Mutation
    argument :post_id, ID, required: true
    argument :comment, String, required: true

    description "Create a comment on a post"

    field :id, ID, null: true
    field :errors, [String], null: false

harigopal

# app/graphql/types/query_type.rb
module Types
  class QueryType < Types::BaseObject
    field :user, Types::UserType, null: false do
      argument :id, ID, required: true
    end

    def user
      resolver = UserResolver.new(context, args)
      resolver.user

harigopal

# app/queries/users_resolver.rb
class UsersResolver < ApplicationQuery
  def users  
    scope = if current_user.admin?
      User.all
    else
      current_user.team.users
    end
    
    # Avoid N+1 when accessing the avatar, with a shortcut for `.includes(avatar_attachment: :blob)`.

harigopal

# app/graphql/types/query_type.rb
module Types
  class QueryType < Types::BaseObject
    field :users, [Types::UserType], null: false

    def users
      resolver = UsersResolver.new(context)
      resolver.users
    end
  end

harigopal

# app/queries/application_query.rb
class ApplicationQuery
  include ActiveModel::Model

  # Set up accessors with validations in a single step.
  def self.property(name, options = {})
    attr_accessor name
    validates(name, options[:validates]) if options.key?(:validates)
  end