[英]RoR error: SQLite3::SQLException: no such column: comments.micropost_id: SELECT “comments”.* FROM “comments” WHERE “comments”.“micropost_id” = 2
I am developing an app with users where they each have set of microposts displayed on their pages. 我正在为用户开发一个应用程序,每个用户都在页面上显示一组微博。 I am trying to add comments to these microposts.
我正在尝试为这些微博添加评论。 Every time I visit localhost:3000/users/(user_id_#).
每次我访问localhost:3000 / users /(user_id_#)。 The user_id was 2 in the error given in the title.
标题中给出的错误中user_id为2。
SQLite3::SQLException: no such column: comments.micropost_id: SELECT "comments".* FROM "comments" WHERE "comments"."micropost_id" = 2 SQLite3 :: SQLException:没有这样的列:comments.micropost_id:SELECT“comments”。* FROM“comments”WHERE“comments”。“micropost_id”= 2
This error only comes when the user has microposts to show. 仅当用户显示微博时才会出现此错误。 Otherwise it just shows their blank page.
否则它只显示他们的空白页面。 The error comes from this view for app/views/users/show.html.erb This view renders this partial, where the error occurs in line 13.
此错误来自此视图的app / views / users / show.html.erb此视图呈现此部分,其中错误发生在第13行。
<li>
<span class="content"><%= micropost.content %></span>
<span class="timestamp">
Posted <%= time_ago_in_words(micropost.created_at) %> ago.
</span>
<% if current_user?(micropost.user) %>
<%= link_to "delete", micropost, method: :delete,
confirm: "You sure?",
title: micropost.content %>
<% end %>
<h2>Comments</h2>
<% micropost.comments.each do |comment| %>
<p>
<b>Commenter:</b>
<%= comment.commenter %>
</p>
<p>
<b>Comment:</b>
<%= comment.body %>
</p>
<% end %>
<h3>Add a comment:</h3>
<%= form_for([micropost, micropost.comments.build]) do |f| %>
<div class="field">
<%= f.label :commenter %><br />
<%= f.text_field :commenter %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
</li>
Here is my comment.rb file 这是我的comment.rb文件
class Comment < ActiveRecord::Base
belongs_to :micropost
attr_accessible :body, :user_id
end
and my micropost.rb file 和我的micropost.rb文件
class Micropost < ActiveRecord::Base
attr_accessible :content
belongs_to :user
has_many :comments
validates :content, presence: true, length: { maximum: 140 }
validates :user_id, presence: true
end
and my comments_controller.rb 和我的comments_controller.rb
class CommentsController < ApplicationController
def create
@micropost = Micropost.find(params[:micropost_id])
@comment = @micropost.comments.create(params[:comment])
redirect_to micropost_path(@micropost)
end
end
and finally my microposts_controller.rb 最后是我的microposts_controller.rb
class MicropostsController < ApplicationController
before_filter :signed_in_user
before_filter :correct_user, only: :destroy
def create
@micropost = current_user.microposts.build(params[:micropost])
if @micropost.save
flash[:success] = "Micropost created!"
redirect_to root_path
else
@feed_items = []
render 'static_pages/home'
end
end
def new
@micropost = Micropost.new(params[:micropost])
end
def show
@micropost = Micropost.find(params[:id])
end
def destroy
@micropost.destroy
redirect_back_or root_path
end
private
def correct_user
@micropost = current_user.microposts.find_by_id(params[:id])
redirect_to root_path if @micropost.nil?
end
end
class CommentsController < ApplicationController
def create
@micropost = Micropost.find(params[:micropost_id])
@comment = @micropost.comments.create(params[:comment])
redirect_to micropost_path(@micropost)
end
end
also here is the users_controller.rb 这里还有users_controller.rb
class UsersController < ApplicationController
before_filter :signed_in_user,
only: [:index, :edit, :update, :destroy, :following, :followers]
before_filter :correct_user, only: [:edit, :update]
before_filter :admin_user, only: :destroy
def index
@users = User.paginate(page: params[:page])
end
def show
@user = User.find(params[:id])
@microposts = @user.microposts.paginate(page: params[:page])
end
def new
@user = User.new
end
def create
@user = User.new(params[:user])
if @user.save
sign_in @user
flash[:success] = "Welcome to the Sample App!"
redirect_to @user
else
render 'new'
end
end
def edit
end
def update
if @user.update_attributes(params[:user])
flash[:success] = "Profile updated"
sign_in @user
redirect_to @user
else
render 'edit'
end
end
def destroy
User.find(params[:id]).destroy
flash[:success] = "User destroyed."
redirect_to users_path
end
def following
@title = "Following"
@user = User.find(params[:id])
@users = @user.followed_users.paginate(page: params[:page])
render 'show_follow'
end
def followers
@title = "Followers"
@user = User.find(params[:id])
@users = @user.followers.paginate(page: params[:page])
render 'show_follow'
end
private
def correct_user
@user = User.find(params[:id])
redirect_to(root_path) unless current_user?(@user)
end
def admin_user
redirect_to(root_path) unless current_user.admin?
end
end
from the error it sounds like the @micropost isnt being initialized in the microposts_controller.rb file under def show. 从错误中听起来@micropost没有在def show下的microposts_controller.rb文件中初始化。 but I think it is?
但我认为是吗? What am I doing wrong?
我究竟做错了什么? Thanks
谢谢
also here is app/views/users/show.html.erb 这里还有app / views / users / show.html.erb
<% provide(:title, @user.name) %>
<div class="row">
<aside class="span4">
<section>
<h1>
<%= gravatar_for @user %>
<%= @user.name %>
</h1>
</section>
</aside>
<div class="span8">
<%= render 'follow_form' if signed_in? %>
<% if @user.microposts.any? %>
<h3>Microposts (<%= @user.microposts.count %>)</h3>
<ol class="microposts">
<%= render @microposts %>
</ol>
<%= will_paginate @microposts %>
<% end %>
</div>
</div>
here is the create comments migration 这是创建注释迁移
class CreateComments < ActiveRecord::Migration
def change
create_table :comments do |t|
t.string :user_id
t.text :body
t.references :micropost_id
t.timestamps
end
add_index :comments, :micropost_id
end
end
The error makes it sound like you haven't made a migration to add micropost_id to comment and migrated the database, so I'd start there. 这个错误让人觉得你没有进行迁移来添加micropost_id来评论和迁移数据库,所以我从那里开始。
Your migration shows that you are using 您的迁移显示您正在使用
t.references :micropost_id
However t.references accepts a model name, not a foreign_key, so change it to 但是,t.references接受模型名称,而不是foreign_key,因此将其更改为
t.references :micropost
or change references to an integer for micropost_id, either should give you the result you want. 或更改对micropost_id的整数的引用,或者应该给你想要的结果。
You may need to do rake db:reset
to get everything back to where you want it after you fix the migration. 您可能需要执行
rake db:reset
以在修复迁移后将所有内容恢复到所需位置。
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