当我在 Rails 4.0 中运行我的 rails show 页面时，我注意到每次无论 id 是否为 nil，它都会重定向到 404.html 页面。虽然这对 nil 来说很好，但确实有数据的那些似乎会重定向到相同的东西。因此，如果我说页面 localhost/accounts/gmills@gome.com 它会重定向到 404 页面，即使它存在于我的数据库中。我希望使用电子邮件或用户名来区分用户，而不是仅使用 id 字段。
我可以使用你的建议来解决这个问题并让它工作，以便它只在 Rails 4.0 中的 nil 页面上进入 404。
MYSQL 数据库
MySQL Table account
id first_name last_name email
1 gill mills gmills@gome.com
2 jib jab jjab@morris.com
帐户控制器
class AccountsController < ApplicationController
respond_to :html
before_filter :load_findaccount, :only => [:show, :edit, :update]
def index #Displays all of the names that are stored in the database
@accounts = Account.all
end
def new #allows the creation of new Name accounts
@account = Account.new
#new_account_path(:first_name
end
def create
@account =Account.new(account_params)
#@account = Account.new(params[:account])
if @account.save
redirect_to @account
else
render "new"
end
end
def show
@account = Account.find_by_email(params[:id])
if @account.nil?
render "shared/404"
else
respond_with(@account)
end
end
private
# Using a private method to encapsulate the permissible parameters is
# just a good pattern since you'll be able to reuse the same permit
# list between create and update. Also, you can specialize this method
# with per-user checking of permissible attributes.
def account_params
params.require(:account).permit(:first_name, :last_name, :email)
end
def load_findaccount
#params[:id] remains fixed but find_by_id changes to username
#@account = Account.find_by(params[:id])
#user_path(user)
end
end
# def create
# @groupee = Groupee.new(params[:groupee])
# if @groupee.save
# session[:groupee_id] = @groupee.id
# flash[:success] = "Welcome #{@groupee.username} to MusicBand"
# redirect_to @groupee, :notice => "Groupee Account successfully created." #Changing users to user redirects to a specific user page
# else
# render "new"
# end
# end
账户模型
class Account < ActiveRecord::Base
def to_param # overridden
email
end
validates :first_name, :presence => true
validates :last_name, :presence => true
validates :email, :presence => true, :uniqueness =>{:case_sensitive => false}
end
显示视图
<h1>Displays a specific name_account on the server</h1>
<h1>First_name</h1>
<%= @account.first_name %>
<h1>Last_name</h1>
<%= @account.last_name %>
<h1>Email</h1>
<%= @account.email %>
索引视图
<h1>Displays all of the name_accounts on the server</h1>
<table>
<tr>
<td>First_name</td>
<td>Last_name</td>
<td>Email</td>
</tr>
<% @accounts.each do |account| %>
<tr>
<td><%= account.first_name %></td>
<td><%= account.last_name %></td>
<td><%= account.email %></td>
</tr>
<% end %>
</table>
404页
<!DOCTYPE html>
<html>
<head>
<title>The page you were looking for doesn't exist (404)</title>
<style>
body {
background-color: #EFEFEF;
color: #2E2F30;
text-align: center;
font-family: arial, sans-serif;
}
div.dialog {
width: 25em;
margin: 4em auto 0 auto;
border: 1px solid #CCC;
border-right-color: #999;
border-left-color: #999;
border-bottom-color: #BBB;
border-top: #B00100 solid 4px;
border-top-left-radius: 9px;
border-top-right-radius: 9px;
background-color: white;
padding: 7px 4em 0 4em;
}
h1 {
font-size: 100%;
color: #730E15;
line-height: 1.5em;
}
body > p {
width: 33em;
margin: 0 auto 1em;
padding: 1em 0;
background-color: #F7F7F7;
border: 1px solid #CCC;
border-right-color: #999;
border-bottom-color: #999;
border-bottom-left-radius: 4px;
border-bottom-right-radius: 4px;
border-top-color: #DADADA;
color: #666;
box-shadow:0 3px 8px rgba(50, 50, 50, 0.17);
}
</style>
</head>
<body>
<!-- This file lives in public/404.html -->
<div class="dialog">
<h1>The page you were looking for doesn't exist.</h1>
<p>You may have mistyped the address or the page may have moved.</p>
</div>
<p>If you are the application owner check the logs for more information.</p>
</body>
</html>