Ruby on rails Can'；t因为Postgres而取消跟踪用户

Rails 3.2，Twitter应用程序

更新：解决了，但知道为什么它会工作一次，然后当我再试一次时，我在第16行

users\u controller.rb

上得到@user的

Unknown key:

。如果我更新一个状态或重新登录它的罚款

解决方案：在添加

通知：“Added”后，将\u重定向到每个if/else下的\u路径

。我无法为“未找到用户”tho生成错误

我得到了一张的表格，我输入了：用户名，它在后面或后面。不要随波逐流。看起来像这样

错误

PG:：UndefinedTable:错误：表“id”的子句条目中缺少
第1行：从“关系”中删除，其中“id”。“follower_id”=1和。。。
^
：从“关系”中删除，其中“id”。“follower\u id”=1和“id”。“followerd\u id”=2

身份证不见了？所以我认为问题出在

关系\u 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

  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

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

/users/buddies.html.erb

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

user.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

  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

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

relationships\u 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

  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

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

---

这是很多词，但要注意关系。删除。。需要更改哪些内容？

Relationship.delete需要id。请尝试以下操作：

# 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，如果以下是关系：

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

---

是的，你搞定了。但是加上你的冒号！然后它成功了。我用了第一个。第二个没那么热。谢谢，很高兴它成功了。Arg。我在

followed:user.id

和

:followed=>user.id

语法之间切换。抢手货此外，我发现followeds实际上不是一个关联，而是一个集合。很高兴你找到了解决方案。你不必，但是你能在顶部诊断我的新错误吗？如果连续跟踪/取消跟踪两次，似乎会发生这种情况。对于您的flash消息，这将取决于您是否在错误时重定向。如果只是渲染，请使用

flash.now[：error]=“愚蠢的错误”

。这将填充闪存错误以便立即使用。至于另一个错误，看起来您正在传递一个模型（用户）的实例，而它可能应该是一个符号或字符串，这取决于问题所在。我不知道16号线和它周围有什么。顺便说一句，你们有并没有看一些想法？那个教程就是我复制的：P我正在构建一些稍微不同的东西。我还解决了这个问题，我只需在我的each.follow.unfollow语句下添加一行

notice/redirect

。