无法找到没有ID的用户,rails 4

Question

我有两种用户类型:艺术家和粉丝.我希望粉丝能够跟随艺术家.到目前为止,它们不起作用,但取消后续工作.我有create和destroy建立以同样的方式,但似乎无法得到它的工作.我在尝试create关系时遇到错误找不到没有ID的艺术家.无论如何,我可以找到艺术家的ID？

代码如下:

relationships_controller.rb

class RelationshipsController < ApplicationController

  before_action :authenticate_fan!

  def create
    @relationship = Relationship.new
    @relationship.fan_id = current_fan.id
    @relationship.artist_id = Artist.find(params[:id]).id #the error
    if @relationship.save
      redirect_to (:back)
    else
      redirect_to root_url
    end
  end

  def destroy
    current_fan.unfollow(Artist.find(params[:id]))
    redirect_to (:back)
  end

end

artists_controller.rb

def show
  @artist = Artist.find(params[:id])
end

艺术家/ show.html.erb

<% if fan_signed_in? && current_fan.following?(@artist) %>
  <%= button_to "unfollow", relationship_path, method: :delete, class: "submit-button" %>
<% elsif fan_signed_in? %>
  <%= form_for(Relationship.new, url: relationships_path) do |f| %>
    <%= f.submit "follow", class: "submit-button" %>
  <% end %>
<% end %>

车型/ fan.rb

has_many :relationships, dependent: :destroy
has_many :artists, through: :relationships
belongs_to :artist

def following?(artist)
  Relationship.exists? fan_id: id, artist_id: artist.id
end

def unfollow(artist)
  Relationship.find_by(fan_id: id, artist_id: artist.id).destroy
end

车型/ artists.rb

has_many :relationships, dependent: :destroy
has_many :fans, through: :relationships
belongs_to :fan

的routes.rb

resources :relationships, only: [:create, :destroy]

Answer 1

基本上,您需要发送artist_id到操作.改变你form的想法.需要进行大量的重构,但这一步对您有用:

<%= form_for(Relationship.new, url: relationships_path) do |f| %>
  <%= hidden_field_tag :artist_id, @artist.id %>
  <%= f.submit "follow", class: "submit-button" %>
<% end %>

在控制器中,您可以像以下一样访问它:

@relationship.artist_id = Artist.find(params[:artist_id]).id