Question

我已经和这个用户进行过一段时间的摔跤了。我的索引页面中的图像（或默认值）不显示。我使用了回形针，除了这个页面，它可以在其他任何地方使用。

user.rb

has_attached_file :avatar, styles: { larger: "280x280#", medium: "300x300#", thumb: "50x50#", followp: "208x208#" }, 
                            default_url: "/assets/default.png",
                            :url  => "/assets/products/:id/:style/:basename.:extension",
                            :path => ":rails_root/public/assets/products/:id/:style/:basename.:extension"

user_controller.rb

def index
  #@user = User.find(params[:id]) **This causes the error "couldn't find the user w/o an id"**
  @users = User.where.not("id = ?",current_user.id).order("created_at DESC")
  @conversations = Conversation.involving(current_user).order("created_at DESC")
end

index.html.erb

<div id="content-box">
  <h1>Chat</h1>
    <div>
  <% if @conversations.any? %>
    <ul class="media-list">
      <% @conversations.each do |conversation| %>
        <li class="media">
          <%= image_tag @user.avatar(:thumb), class: "media-object pull-left" unless @user.nil? **removing this causes "undefined method avatar for nil:NilClass"** %>

conversation_controller.rb

def create
  if Conversation.between(params[:sender_id],params[:recipient_id]).present?
    @conversation = Conversation.between(params[:sender_id],params[:recipient_id]).first
  else
    @conversation = Conversation.create!(conversation_params)
  end

  render json: { conversation_id: @conversation.id }
end

def show
  @user = User.find(params[:id])
  @conversation = Conversation.find(params[:id])
  @reciever = interlocutor(@conversation)
  @messages = @conversation.messages
  @message = Message.new
end

更新

对话模型

class Conversation < ActiveRecord::Base
  belongs_to :sender, :foreign_key => :sender_id, class_name: 'User'
  belongs_to :recipient, :foreign_key => :recipient_id, class_name: 'User'

  has_many :messages, dependent: :destroy

  validates_uniqueness_of :sender_id, :scope => :recipient_id

  scope :involving, -> (user) do
    where("conversations.sender_id =? OR conversations.recipient_id =?",user.id,user.id)
  end

  scope :between, -> (sender_id,recipient_id) do
    where("(conversations.sender_id = ? AND conversations.recipient_id =?) OR (conversations.sender_id = ? AND conversations.recipient_id =?)", sender_id,recipient_id, recipient_id, sender_id)
  end
end

User.rb

  has_many :conversations, :foreign_key => :sender_id

Answer 1

试试这个：

<div id="content-box">
  <h1>Chat</h1>
    <div>
  <% if @conversations.any? %>
    <ul class="media-list">
      <% @conversations.each do |conversation| %>
        <li class="media">
          <%= image_tag User.find_by_id(conversation.sender_id).avatar(:thumb), class: "media-object pull-left" %>

Answer 2

我明白了。它实际上隐藏在辅助方法

中

<%= image_tag conversation_interlocutor(conversation).avatar(:thumb), class: "media-object pull-left" %>

用户＆＃39;图像没有显示出来

2 个答案: