【发布时间】：2016-08-20 01:44:36
【问题描述】：
不太确定“活动记录”是否是正确的术语。数据库？ Postgres？
我正在关注Rails Tutorial，遇到了一个非常令人沮丧的问题。我在 SO 上找到了很多帖子，人们都在苦苦挣扎，但其中大多数都离题太远了，所以我试图找出我的例子有什么问题。
我的用户控制器
类用户控制器
# GET /users
# GET /users.json
def index
@users = User.all
end
# GET /users/1
# GET /users/1.json
def show
end
# GET /users/new
def new
@user = User.new
end
# GET /users/1/edit
def edit
end
# POST /users
# POST /users.json
def create
@user = User.new(user_params)
respond_to do |format|
if @user.save
format.html { redirect_to @user, notice: 'User was successfully created.' }
format.json { render :show, status: :created, location: @user }
else
format.html { render :new }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /users/1
# PATCH/PUT /users/1.json
def update
respond_to do |format|
if @user.update(user_params)
format.html { redirect_to @user, notice: 'User was successfully updated.' }
format.json { render :show, status: :ok, location: @user }
else
format.html { render :edit }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.json
def destroy
@user.destroy
respond_to do |format|
format.html { redirect_to users_url, notice: 'User was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
@user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:name, :email)
end
end
我的用户模型
class User < ApplicationRecord
has_many :micropost
validates :name, presence: true
validates :email, presence: true
end
我的微博模型
class Micropost < ApplicationRecord
belongs_to :user
validates :content, length: { maximum: 140 },
presence: true
end
我的微博控制器
class MicropostsController < ApplicationController
before_action :set_micropost, only: [:show, :edit, :update, :destroy]
# GET /microposts
# GET /microposts.json
def index
@microposts = Micropost.all
end
# GET /microposts/1
# GET /microposts/1.json
def show
end
# GET /microposts/new
def new
@micropost = Micropost.new
end
# GET /microposts/1/edit
def edit
end
# POST /microposts
# POST /microposts.json
def create
@micropost = Micropost.new(micropost_params)
respond_to do |format|
if @micropost.save
format.html { redirect_to @micropost, notice: 'Micropost was successfully created.' }
format.json { render :show, status: :created, location: @micropost }
else
format.html { render :new }
format.json { render json: @micropost.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /microposts/1
# PATCH/PUT /microposts/1.json
def update
respond_to do |format|
if @micropost.update(micropost_params)
format.html { redirect_to @micropost, notice: 'Micropost was successfully updated.' }
format.json { render :show, status: :ok, location: @micropost }
else
format.html { render :edit }
format.json { render json: @micropost.errors, status: :unprocessable_entity }
end
end
end
# DELETE /microposts/1
# DELETE /microposts/1.json
def destroy
@micropost.destroy
respond_to do |format|
format.html { redirect_to microposts_url, notice: 'Micropost was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_micropost
@micropost = Micropost.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def micropost_params
params.require(:micropost).permit(:content, :user_id)
end
end
我的 show.html.erb
<p id="notice"><%= notice %></p>
<p>
<strong>Name:</strong>
<%= @user.name %>
</p>
<p>
<strong>Email:</strong>
<%= @user.email %>
<% if @user.micropost.any? %>
<%= @user.micropost.first %>
<% end %>
</p>
<%= link_to 'Edit', edit_user_path(@user) %> |
<%= link_to 'Back', users_path %>
当我加载用户页面（在我的情况下为 6 或 7）时，我看到“某物”以这种格式输出，但它正在显示 我觉得哪个是 Active Record (?) 索引？我不知道如何让它显示用户的第一个（或任何一个）微博。
在一些解决方案中，我看到人们使用了 render @user.micropost 但我遇到了一个关于部分的问题（我很熟悉），但教程说你应该能够使用以前使用的语法（又名 @user.email ) 来解决它。所以我觉得我把它复杂化了？
【问题讨论】：