由于 Postgres 无法取消关注用户

Question

Rails 3.2，Twitter 应用

更新：已解决但知道为什么它可能会工作一次，然后当我再次尝试时，我在第 16 行得到Unknown key: #<User:0x007f9a5a946708> @user users_controller.rb。如果我更新状态或重新登录就可以了。

解决方案：在每个 if/else 下添加 notice: "Added", redirect_to_path 后，它工作正常。我无法为“找不到用户”生成错误。

我有一个form_for，我输入:username，它会关注或取消关注。取消关注不起作用。看起来像这样。

Error

PG::UndefinedTable: ERROR: missing FROM-clause entry for table "id" LINE 1: DELETE FROM "relationships" WHERE "id"."follower_id" = 1 AND... ^ : DELETE FROM "relationships" WHERE "id"."follower_id" = 1 AND "id"."followed_id" = 2

id 不见了？所以我认为问题出在relationship_controller.rb

/users/buddies.html.erb

<%= form_for :username, :url => {:action => :buddies} do |f| %>
<%= f.text_field @user, placeholder: "username" %>
<%= f.submit "Add/Subtract" %>
<% end %>

users_controller.rb

@user = User.find_by_username(params[:username])

            if @user
                unless @user.blank?
                if current_user.following? @user
                    current_user.unfollow @user
                  else
                    current_user.follow @user
                end
              else
                flash[:error] = "stupid error";
                end
            end

user.rb

  def following? user
   self.followeds.include? user
  end

  def follow user
    Relationship.create follower_id: self.id, followed_id: user.id
  end

 def unfollow user
   Relationship.delete follower_id: self.id, followed_id: user.id
 end

relationships_controller.rb

def create

    @relationship = Relationship.new(params[:relationship]) 
    #@relationship.followed_id = params[:followed_id]
    @relationship.follower_id = current_user.id

    if @relationship.save
        redirect_to buddies_path, notice: "Phriend added"
        else
        flash[:error] = "Phriend not added";
        redirect_to buddies_path
    end
end

def delete
    @relationship = Relationship.find(params[:id])
    @relationship.delete
    redirect_to buddies_path, notice: "Phriend subtracted"
end

这么多字，但看看Relationship.delete..那里需要改变什么？

Answer 1

Relationship.delete 需要一个 id。尝试类似：

# app/models/user.rb
def unfollow user
  Relationship.where(:follower_id => self.id, :followed_id => user.id).first.delete
end

或者，也许更清楚一点，如果跟随的是关系：

def unfollow user
  self.followeds.where(:followed_id => user.id).first.delete
end
#didn't work for @ladiesman217