ユーザー (x) が別のユーザー (y) を友達として追加できるようにしたいのですが、ユーザー (x) はユーザー (y) のプロフィール ページにいます。has_many_through を設定すると、User Index View からのみ友達を追加できることを除いて、すべてが機能します。よろしくお願いします...コードは以下のとおりです。
また：
view/profile/show.html.erb に「友達」リンクを配置したかったのです。@users = User.all を既存の profiles_controller.rb に追加すると、エラーが発生しました - undefined method friendships' for nil:NilClass. When I replaced @user = User.find(params[:id]) with @users = User.all I received the error - NoMethodError in Profiles#show... undefined methodinverse_friends' for nil:NilClass
UserIndexView では動作するが ProfileShowView では動作しないコード:
% for user in @users %>
<div class="user">
<p>
<strong><%=h user.email %> <%= user.id %></strong>
<%= link_to "Add Friend", friendships_path(:friend_id => user), :method => :post%>
<div class="clear"></div>
</p>
</div>
<% end %>
次のエラーが発生します。
NoMethodError in Profiles#show
Showing /Users/mgoff1/LOAP_1.2.2/app/views/profiles/show.html.erb where line #13 raised:
undefined method `each' for nil:NilClass
Extracted source (around line #13):
10:
11:
12:
13: <% for user in @users %>
14: <div class="user">
15: <p>
16: <strong><%=h user.email %> <%= user.id %></strong>
. . .
app/views/profiles/show.html.erb: 13:in`_app_views_profiles_show_html_erb___2905846706508390660_2152968520'
app/controllers/profiles_controller.rb:19:in `show'
残りのコードは以下のとおりです。
友情.rb
class Friendship < ActiveRecord::Base
attr_accessible :create, :destroy, :friend_id, :user_id
belongs_to :user
belongs_to :friend, :class_name => "User"
end
user.rb
class User < ActiveRecord::Base
has_many :friendships
has_many :friends, :through => :friendships
has_many :inverse_friendships, :class_name => "Friendship", :foreign_key => "friend_id"
has_many :inverse_friends, :through => :inverse_friendships, :source => :user
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation, :remember_me, :profile_attributes
# attr_accessible :title, :body
has_one :profile
accepts_nested_attributes_for :profile
before_save do | user |
user.profile = Profile.new unless user.profile
end
end
friends_controller.rb
class FriendshipsController < ApplicationController
def create
@friendship = current_user.friendships.build(:friend_id => params[:friend_id])
if @friendship.save
flash[:notice] = "Added friend."
redirect_to current_user.profile
else
flash[:error] = "Unable to add friend."
redirect_to root_url
end
end
def destroy
@friendship = current_user.friendships.find(params[:id])
@friendship.destroy
flash[:notice] = "Removed friendship."
redirect_to current_user.profile
end
end
users_controller.rb
class UsersController < ApplicationController
def show
@user = User.find(params[:id])
end
def index
@users = User.all
end
end
profile_controller.rb
class ProfilesController < ApplicationController
# GET /profiles
# GET /profiles.json
def index
@profiles = Profile.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: @profiles }
end
end
# GET /profiles/1
# GET /profiles/1.json
def show
@user = User.find(params[:id])
@profile = Profile.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: @profile }
end
end
# GET /profiles/new
# GET /profiles/new.json
def new
@profile = Profile.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: @profile }
end
end
# GET /profiles/1/edit
def edit
@user = User.find(params[:id])
@profile = Profile.find(params[:id])
end
# POST /profiles
# POST /profiles.json
def create
@profile = Profile.new(params[:profile])
respond_to do |format|
if @profile.save
format.html { redirect_to @profile, notice: 'Profile was successfully created.' }
format.json { render json: @profile, status: :created, location: @profile }
else
format.html { render action: "new" }
format.json { render json: @profile.errors, status: :unprocessable_entity }
end
end
end
# PUT /profiles/1
# PUT /profiles/1.json
def update
@profile = Profile.find(params[:id])
respond_to do |format|
if @profile.update_attributes(params[:profile])
format.html { redirect_to @profile, notice: 'Profile was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: @profile.errors, status: :unprocessable_entity }
end
end
end
# DELETE /profiles/1
# DELETE /profiles/1.json
def destroy
@profile = Profile.find(params[:id])
@profile.destroy
respond_to do |format|
format.html { redirect_to profiles_url }
format.json { head :no_content }
end
end
end
ルート.rb
BaseApp::Application.routes.draw do
resources :friendships
resources :profiles
#get "users/show"
devise_for :users, :controllers => { :registrations => "registrations" }
resources :users
match '/show', to: 'profile#show'
match '/signup', to: 'users#new'
root to: 'static_pages#home'
match '/', to: 'static_pages#home'
. . .