ruby on rails - Grape::API – RuntimeError: Circular dependency detected while autoloading constant User -

ruby on rails - Grape::API – RuntimeError: Circular dependency detected while autoloading constant User -

i'm testing grap api framework rails 4.1, i'm stuck on circlar dependency. thought why it?

app/api/v1/user.rb

module v1 class user < grape::api format :json desc 'returns pong.' :user { ping: params[:pong] || 'pong' } end end end

app/api/api.rb

class api < grape::api prefix 'api' mount v1::user end

app/models/user.rb

class user < activerecord::base [cut...]

ruby-on-rails grape grape-api