Ruby/Rails: friend_id is not added to friendships table

问题

Using the Rails 4.1.4 framework. Having a problem adding a 'friend_id' to the user_friendships table below... when the program runs in rails, I am redirected to the root (as expected) and given the success message that the friendship was created. However, when I crack open the database GUI, I see that only a user_id is saved into the user_id column, and the friend_id column is always left 'nil', no matter who friends who. I've searched high and low - I know it must be something simple and it's driving me crazy. Any help is much appreciated!

Can anyone see the mistake I may have made in the code that would prevent this from being saved? Could it be a missing strong parameters issue for friend_id, and if so, how do I go about correcting it?

The Models:

class User < ActiveRecord::Base
  has_many :user_friendships
  has_many :friends, through: :user_friendships


class UserFriendship < ActiveRecord::Base
    belongs_to :user
    belongs_to :friend, class_name: 'User', foreign_key: 'friend_id'

The Controller:

class UserFriendshipsController < ApplicationController
    before_filter :authenticate_user!, only: [:new]

    def new
        if params[:friend_id]
            @friend = User.where(profile_name: params[:friend_id]).first
            raise ActiveRecord::RecordNotFound if @friend.nil?
            @user_friendship = current_user.user_friendships.new(friend: @friend)
        else
            flash[:error] = 'Friend required.'
        end

        rescue ActiveRecord::RecordNotFound
            render file: 'public/404', status: :not_found
    end

    def create
        if params[:user_friendship] && params[:user_friendship].has_key?(:friend_id)
            @friend = User.where(profile_name: params[:user_friendship][:friend_id]).first
            @user_friendship = current_user.user_friendships.new(friend: @friend)
            @user_friendship.save
            redirect_to root_path
            flash[:success] = "You are now friends." #{@friend.full_name}
        else
            flash[:error] = 'Friend required.'
            redirect_to root_path
        end
    end

user_friendships view files --new.html.erb

<% if @friend %>

    <h1> <%= @friend.full_name %> </h1>

    <p> Do you really want to become friends with <%= @friend.full_name %>?</p>

    <%= form_for @user_friendship, method: :post do |f| %>
        <div class="form form-actions">
            <%= f.hidden_field :friend_id, value: @friend.profile_name %>
            <%= submit_tag "Yes, Add Friend", class: 'btn btn-primary' %>
            <%= link_to "Cancel", profile_path(@friend), class: 'btn' %>
        </div>

    <% end %>

<% end %>

-- submission button for form above on profile page

<div class="page-header">
    <h1> <%= @user.full_name%> </h1>
    <%= link_to "Add Friend", new_user_friendship_path(friend_id: @user), class:'btn'%>
</div>

回答1:

You have a problem with profile_name. I don't know what is it, but it should be an id. So, in controller change model search to:

@friend = User.find_by_id(params[:user_friendship][:user_id])

And in template <%= f.hidden_field :friend_id, value: @friend.id %>

This works for me

However, if you are using friendly_id gem, or another thing that force you to use profile_name instead of id, you should also use it in other places, like links:

new_user_friendship_path(friend_id: @user.profile_name)

Maybe this will help.

来源：https://stackoverflow.com/questions/25458439/ruby-rails-friend-id-is-not-added-to-friendships-table

标签

ruby-on-rails

associations

jointable