Implementing resource_owner_authenticator doesnt work - ruby-on-rails-4

Question

I'm writing an API aside with an web page. I want to have Oauth2 login so i can keep a session from the mobile device, i've already install the GEM doorkeeper and run the migration how it's explained on this site.
where i'm getting stuck is in the resource_owner_from_credentials parts, since i have an User model which has authenticate method given by the has_secure_password helper from rails. this is how my /config/initializers/doorkeeper.rb file looks like
Doorkeeper.configure do
# Change the ORM that doorkeeper will use.
# Currently supported options are :active_record, :mongoid2, :mongoid3, :mongo_mapper
orm :active_record
# This block will be called to check whether the resource owner is authenticated or not.
resource_owner_from_credentials do
User.find_by_email(params[:email]).authenticate(params[:password])
end
##lots of comments
end
and when go to
localhost:3000/oauth/authorize
i get this:
config/initializers/doorkeeper.rb:8:in `block (2 levels) in <top (required)>'
then i tried:
http://127.0.0.1:3000/oauth/authorize?email=puca#gmail.com&password=porche
and the same
what i'm i doing wrong? how should i configuresource_owner_authenticator block? how do i get the token?

Answer 1

As per this doorkeeper wiki page you need to send a POST request to /oauth/token API with the following params:
{
"grant_type" : "password",
"username" : "user#example.com",
"password" : "sekret"
}
When this request is processed, doorkeeper calls the resource_owner_from_credentials block and passes the params to it. So you have access to the param named username and not email.
To summarize, fix the API endpoint to /oauth/token , change params[:email] to params[:username] and everything should work.