# app/graphql/post_type.rb
module Types
  class PostType < Types::BaseObject
    field :id, GraphQL::Types::ID, null: true
    field :title, String, null: true
    field :body, String, null: true
    field :created_at, GraphQL::Types::ISO8601DateTime, null: true
    field :updated_at, GraphQL::Types::ISO8601DateTime, null: true
  end
end

# app/graphql/types/post_input.rb
module Types
  module Input
    class PostInput < Types::BaseInputObject
      argument :title, String, required: false
      argument :body, String, required: false
    end
  end
end

# app/graphql/types/post_input.rb
module Types
  module Input
    class PostInput < Types::BaseInputObject
      argument :title, String, required: false
      argument :body, String, required: false
    end
  end
end

# app/graphql/mutations/update_post.rb
module Mutations
  class UpdatePost < Mutations::BaseMutation
    field :post, Types::PostType, null: true

    argument :attributes, Types::Input::PostInput, required: true
    argument :id, GraphQL::Types::ID, required: false

    def resolve(attributes:, id: nil)
      model = find_or_build_model(id)
      model.attributes = attributes.to_h
      if model.save
        {post: model}
      else
        {errors: model.errors.full_messages}
      end
    end

    def find_or_build_model(id)
      if id
        Post.find(id)
      else
        Post.new
      end
    end
  end
end

# app/graphql/resolvers/base_search_resolver.rb
module Resolvers
  class BaseSearchResolver < GraphQL::Schema::Resolver
    require 'search_object'
    require 'search_object/plugin/graphql'
    include SearchObject.module(:graphql)
  end
end

# app/graphql/resolvers/post_search.rb
module Resolvers
  class PostSearch < Resolvers::BaseSearchResolver
    type [Types::PostType], null: false
    description "Lists posts"

    scope { Post.all }

    option(:id, type: Int)   { |scope, value| scope.where id: value }
    option(:title, type: String)   { |scope, value| scope.where title: value }
    option(:body, type: Int)   { |scope, value| scope.where rating: value }
    option(:created_at, type: GraphQL::Types::ISO8601DateTime)   { |scope, value| scope.where created_at: value }
    option(:updated_at, type: GraphQL::Types::ISO8601DateTime)   { |scope, value| scope.where updated_at: value }

    def resolve
      []
    end

  end
end

  #app/graphql/types/query_type.rb
  module Types
  class QueryType < Types::BaseObject
    field :posts, resolver: Resolvers::PostSearch
    ...