我真的不确定如何描述这个问题,我之前从未遇到过这样的问题。我正在尝试建立一个“has_many:through”关联来处理对组的成员请求。其他行动(销毁,更新)似乎工作正常。每当我在控制器中启动创建操作时,对象都会显示正在传递正确的参数并创建关联。但是,它仅为具有“1”id的组创建关联。我不知道如何清楚地解释这个问题或解决它。我将在下面发布我的日志和代码。
澄清我的问题:为什么数据在持续存在于数据库(创建时)时会“改变”?
Cliqs =群组
日志:
Started POST "/cliqs/2/cliq_requests" for ::1 at 2016-03-31 20:35:32 -0500
Processing by CliqRequestsController#create as HTML
Parameters: {"authenticity_token"=>"uaVHFgB7digMywl2a/n2GKMtwi691WA/dw2F2mzdkSCK69C46TZICiSp90xldj3hosFwSOPEi3fSOvOSkIVMjA==", "cliq_id"=>"2"}
Cliq Load (0.0ms) SELECT `cliqs`.* FROM `cliqs` WHERE (2) LIMIT 1
User Load (0.0ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
(0.0ms) BEGIN
SQL (1.0ms) INSERT INTO `cliq_requests` (`cliq_id`, `user_id`, `created_at`, `updated_at`) VALUES (1, 1, '2016-04-01 01:35:32', '2016-04-01 01:35:32')
(198.0ms) COMMIT
Redirected to http://localhost:3000/cliqs
Completed 302 Found in 237ms (ActiveRecord: 199.0ms)
控制器操作:
def create
@cliq = Cliq.find_by(params[:cliq_id])
@cliq_request = current_user.cliq_requests.new(cliq: @cliq)
if @cliq_request.save
redirect_to cliqs_path
else
redirect_to current_user
end
end
其他行动(以防万一):
def update
@cliq = Cliq.find_by(params[:cliq_id])
@cliq_request = CliqRequest.find(params[:id])
@cliq_request.accept
end
def destroy
@cliq = Cliq.find_by(params[:cliq_id])
@cliq_request = CliqRequest.find(params[:id])
@cliq_request.destroy
if @cliq_request.destroy
redirect_to cliqs_path
else
redirect_to current_user
end
end
模特:
class User < ActiveRecord::Base
has_one :owned_cliq, foreign_key: 'owner_id', class_name: 'Cliq', dependent: :destroy
has_many :cliq_memberships, dependent: :destroy
has_many :cliqs, through: :cliq_memberships
has_many :cliq_requests, dependent: :destroy
end
class Cliq < ActiveRecord::Base
belongs_to :owner, class_name: 'User'
has_many :cliq_memberships, dependent: :destroy
has_many :members, through: :cliq_memberships, source: :user
has_many :cliq_requests, dependent: :destroy
has_many :pending_members, through: :cliq_requests, source: :user, foreign_key: 'user_id'
end
class CliqRequest < ActiveRecord::Base
#from
belongs_to :user
#to
belongs_to :cliq
def accept
cliq.members << cliq.pending_members.find(user_id)
destroy
end
end
最后我的观点:
<h1><%= @cliq.name %></h1>
<%= link_to 'Request to join Cliq', cliq_cliq_requests_path(@cliq, @cliq_request), :method => :post %>
<% @cliq_members.each do |cliq_member| %>
<ul><%= link_to cliq_member.username, user_path(cliq_member) %></ul>
<% end %>
<h3>Cliq Requests:</h3>
<ul>
<% @cliq.pending_members.each do |pending_member| %>
<%= link_to pending_member.username, user_path(pending_member) %>
<% end %>
<% @cliq.cliq_requests.each do |cliq_request| %>
<%= link_to "Accept", cliq_cliq_request_path(@cliq, cliq_request), :method => :put %>
<%= link_to "Deny", cliq_cliq_request_path(@cliq, cliq_request), :method => :delete %>
</ul>
<% end %>
答案 0 :(得分:2)
正如您自己发现的那样,@cliq = Cliq.find_by(id: params[:cliq_id])
使用了@cliq = Cliq.find_by(params[:cliq_id])
,而find_by
却没有。那么为什么会这样呢?
find_by
方法符合条件。使用@cliq = Cliq.find_by(some_attribute: "foo")
,您可以匹配任何属性。例如,这也可以:
find_by
因此,使用id
时,必须指定find_by
属性,以便查询返回正确的记录。您的SELECT `cliqs`.* FROM `cliqs` WHERE (2) LIMIT 1
查询实际上运行的SQL看起来像这样:
LIMIT 1
select语句将返回整个表,而@cliq
只会获取第一条记录。
作为奖励,基于params[:cliq_id]
分配find
的首选导轨方式是仅使用@cliq = Cliq.find(params[:cliq_id])
,使用其主键搜索记录:
ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:=strFile