Nested exposure double-exposes a field

[Nerian]

Hi,

class Thing
  def something
    'hello'
  end
end

class Thing::Entity < Grape::Entity
  expose :fields do
    expose :something
  end
end

returns: 

{
  "thing": {
    "fields": {
      "something": "hello"
    },
    "something": "hello"
  }
}

I would expect:

{
  "thing": {
    "fields": {
      "something": "hello"
    },
  }
}

Is this the expected behaviour? How can I get what I want?

I am using master

[dblock]

It should do what you expect. Can you please share code that reproduces the problem?

[Nerian]

Sure here it is:

➜  example  gem list | grep grape       
grape (0.6.1)
grape-entity (0.4.1)

#config.ru

require 'grape'
require 'grape-entity'

class Thing
  def something
    'hello'
  end
end

class Thing::Entity < Grape::Entity
  expose :fields do
    expose :something
  end
end

module Twitter
  class App < Grape::API

    get :some_action do
      present :thing, Thing.new
    end

  end
end

run Twitter::App

Do rackup and go to http://localhost:9292/some_action.json

You should see:

{
  "thing":
  {
    "fields": { "something":"hello" },
    "something":"hello"
  }
}

[dblock]

Unless I am missing something, I think it's most definitely a bug with nested exposures. If you want to be helpful, write a test within grape-entity for this. Maybe you can also fix it :)