我浏览了Treehouses教程，了解如何在添加和删除朋友时建立用户友谊。但是，现在我想说明用户关注的人数以及关注该用户的人数。 Michael Hartl的RoR教程对此进行了讨论，但我不知道如何在Treehouses设置的情况下实现他的教程。我是初学者，我知道在引用用户数时我的控制器是不正确的。我得到一个NoMethodError未定义的方法`followers_count＆＃39;在users / show。
是否有人或有人成功地这样做了？如果有的话，任何关于去哪里看的指示或我如何做到这一点将不胜感激！谢谢。
用户/模型
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :posts
has_many :user_friendships
has_many :friends, through: :user_friendships,
conditions: { user_friendships: { state: 'accepted'} }
has_many :pending_user_friendships, class_name: 'UserFriendship',
foreign_key: :user_id,
conditions: { state: 'pending' }
has_many :pending_friends, through: :pending_user_friendships, source: :friend
has_many :requested_user_friendships, class_name: 'UserFriendship',
foreign_key: :user_id,
conditions: { state: 'requested' }
has_many :requested_friends, through: :pending_user_friendships, source: :friend
has_many :blocked_user_friendships, class_name: 'UserFriendship',
foreign_key: :user_id,
conditions: { state: 'blocked' }
has_many :blocked_friends, through: :pending_user_friendships, source: :friend
has_many :accepted_user_friendships, class_name: 'UserFriendship',
foreign_key: :user_id,
conditions: { state: 'accepted' }
has_many :accepted_friends, through: :pending_user_friendships, source: :friend
validates :name, presence: true
has_one :profile
belongs_to :user
has_attached_file :avatar, :styles => { :medium => "300x300>", :thumb => "150x150>" }, :default_url => "/assets/avatar.png"
validates_attachment_content_type :avatar, :content_type => /\Aimage\/.*\Z/
def has_blocked?(other_user)
blocked_friends.include?(other_user)
end
def followers_count
user_friendships.count
end
def followed_by_count
UserFriendship.where(friend_id: self.id).count
end
end
用户/显示。 HTML
<% provide(:title, @user.name) %>
<div class="row">
<aside class="span4">
<section>
<h1>
<%= image_tag @user.avatar.url(:thumb) %>
<%= @user.name %>
<%= @user.followers_count%>
<%= @user.followed_by_count %>
</h1>
<div id="friend-status">
<% if current_user.friends.include?(@user) || current_user.pending_friends.include?(@user) %>
<%= link_to "Edit Friendship", edit_user_friendship_path(friend_id: @user), class: "btn btn- info btn-sm" %>
<% else %>
<%= link_to "Follow", new_user_friendship_path(friend_id: @user), class: "btn btn- info btn-sm", id: 'add-friendship', data: { friend_id: @user.to_param } %>
<% end %>
</div>
</section>
</aside>
</div>
用户友谊控制器
class UserFriendshipsController < ApplicationController
before_filter :authenticate_user!
respond_to :html, :json
def index
@user_Friendships = UserFriendshipDecorator.decorate_collection(friendship_association.all)
respond_with @user_Friendships
end
def accept
@user_friendship = current_user.user_friendships.find(params[:id])
if @user_friendship.accept_mutual_friendship!
@user_friendship.friend.user_friendships.find_by(friend_id: current_user.id).accept_mutual_friendship!
flash[:success] = "You are now friends with #{@user_friendship.friend.name}!"
redirect_to user_friendships_path
else
flash[:error] = "That friendship could not be accepted."
end
end
def block
@user_friendship = current_user.user_friendships.find(params[:id])
if @user_friendship.block!
flash[:success] = "You have blocked #{@user_friendship.friend.name}."
else
flash[:error] = "This friendship could not be blocked."
end
redirect_to user_friendships_path
end
def new
if params[:friend_id]
@friend = User.find(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.find(params[:user_friendship][:friend_id])
@user_friendship = UserFriendship.request(current_user, @friend)
respond_to do |format|
if @user_friendship.new_record?
format.html do
flash[:error] = "There was a problem creating this friend request."
redirect_to user_path(@friend)
end
format.json { render json: @user_friendship.to_json, status: :precondition_failed }
else
format.html do
flash[:success] = "Friend request sent."
redirect_to user_path(@friend)
end
format.json { render json: @user_friendship.to_json }
end
end
else
flash[:error] = "Friend required"
redirect_to root_path
end
end
def edit
@friend = User.find(params[:id])
@user_friendship = current_user.user_friendships.find_by(friend_id: @friend.id).decorate
end
def destroy
@user_friendship = current_user.user_friendships.find(params[:id])
if @user_friendship.destroy
flash[:success] = "Your friendship was deleted"
end
redirect_to user_friendships_path
end
def user_friendship
params.require(:user_friendship).permit(:user_id, :friend_id, :user, :friend, :state, :user_friendship)
end
def avatar
end
def followers_count
@user_friendship.find_by_follower_id(friend.id)
end
def followed_by_count
@user_friendship.create!(friend_id: friend.id)
end
private
def friendship_association
case params[:list]
when nil
current_user.user_friendships
when 'blocked'
current_user.blocked_user_friendships
when 'pending'
current_user.pending_user_friendships
when 'accepted'
current_user.accepted_user_friendships
when 'requested'
current_user.requested_user_friendships
end
end
end
答案 0 :(得分：1)
看起来您正在将User模型方法与关系模型方法混合使用。您正在调用@user.followers_count正在寻找用户的followers_count方法，该方法不存在。您已在UsersFriendships模型上定义它。你没有包含User模型，但看起来应该是这样的，以消除这个错误，尽管在你过去之后可能会有更多错误。
class User < ActiveRecord::Base
has_many :user_friendships
#everything else
def followers_count
user_friendships.count
end
def followed_by_count
UserFriendship.where(friend_id: self.id).count
end
end
您需要从followers_count模型中删除followed_by_count和UserFriendship。此外，看起来您在控制器中有一些私有方法，也称为followers_count和followed_by_count。