Rails-如何访问父模型中的类？

Question

I'm creating a user using omniauth gem (which is working), but after the user is created, I'd like to create a record in the profile table too (but only when a user is created).

I decided to use a callback in the user model to do this.

However, after the callback is performed and it hits my create_profile method, I run into an error regarding a method in the user model:

undefined method `facebook' for #<Hash:0x007fdf16858200>

Even though I'm passing user: self to the profile model, I am not able to access methods on it.

User.rb

class User < ActiveRecord::Base


    has_one :profile
    has_many :pins
    has_many :replies, through: :pins


    after_create :build_profile


    def self.from_omniauth(auth)

        where(auth.slice(:provider, :provider_id)).first_or_initialize.tap do |user|

            user.provider = auth.provider
            user.provider_id = auth.uid
            user.oauth_token = auth.credentials.token
            user.oauth_expires_at = Time.at(auth.credentials.expires_at)
            user.save

        end

    end


    def build_profile

        Profile.create_profile(user: self)

    end


    def facebook

        @facebook ||= Koala::Facebook::API.new(oauth_token)

    end


end

Profile.rb

class Profile < ActiveRecord::Base


    belongs_to :user


    def self.create_profile(user)

                # undefined method `facebook' for #<Hash:0x007fdf16858200> for this line.
        user.facebook.inspect

    end

end

I'm new to Ruby and Rails...so, please bear with me!

I appreciate you looking this over and telling me where I'm going wrong.

Thanks, Michael.

PS - It seems user.inspect returns the result of a user in my profile.rb model...but I am trying to access the method on that user class.

Answer 1

your build profile method should pass in self instead if the hash user: self

def build_profile
  Profile.create_profile(self)
end

also, build_<has_one_association> is provided by rails.

you can just do

user.build_profile #this will return a profile object with user_id set

If you want to build the associated object, instead of doing

profile = Profile.new(:user_id => user.id)

You could do

profile = user.build_profile

The above will automatically initialize the profile object and set the user_id . In your case, you are overriding the build_profile method provided by rails