English 中文(简体)
• 如何在显示看法时添加以前/以后的联系?
原标题:How to add Previous / Next links in show view?

我认为,我试图增加前言/小节之间的联系。 这个模式:

Position
belongs_to :skill

Skill
has_many :positions, :order =>  salary desc, id desc 

立场/观点:

<%= link_to("Previous", @position.previous) if @position.previous %>
<%= link_to("Next", @position.next) if @position.next %>

页: 1

def next
  self.class
  .where("skill_id = ? AND salary <= ? AND id < ?", skill_id, salary, id)
  .order("salary desc, id desc").first
end

This doesn t do what I want. Records should be ordered first by salary, and than by id.

我认为,这只会给我带来帮助(从表面看看看看不做什么工作)。

最佳回答

我找到了解决办法: 时间相当长,但可以:

where("skill_id = ? AND salary = ? AND id < ?
       OR 
       skill_id = ? AND salary < ?",
       skill_id, salary, id, skill_id, salary
     )
     .order("salary desc, id desc").first
问题回答

你们应当看一看gin子,看看看你所有的逻辑,并创建你们的看法链接,以及<条码>https://github.com/mislav/will_paginate。





相关问题
rails collection_select vs. select

collection_select and select Rails helpers: Which one should I use? I can t see a difference in both ways. Both helpers take a collection and generates options tags inside a select tag. Is there a ...

SSL slowness in EC2

We ve deployed our rails app to EC2. In our setup, we have two proxies on small instances behind round-robin DNS. These run nginx load balancers for a dynamically growing and shrinking farm of web ...

Auth-code with A-Za-z0-9 to use in an URL parameter

As part of a web application I need an auth-code to pass as a URL parameter. I am currently using (in Rails) : Digest::SHA1.hexdigest((object_id + rand(255)).to_s) Which provides long strings like : ...

RubyCAS-Client question: Rails

I ve installed RubyCAS-Client version 2.1.0 as a plugin within a rails app. It s working, but I d like to remove the ?ticket= in the url. Is this possible?

activerecord has_many :through find with one sql call

I have a these 3 models: class User < ActiveRecord::Base has_many :permissions, :dependent => :destroy has_many :roles, :through => :permissions end class Permission < ActiveRecord::...

Ordering a hash to xml: Rails

I m building an xml document from a hash. The xml attributes need to be in order. How can this be accomplished? hash.to_xml

Text Editor for Ruby-on-Rails

guys which text editor is good for Rubyonrails? i m using Windows and i was using E-Texteditor but its not free n its expired now can anyone plese tell me any free texteditor? n which one is best an ...

How to get SQL queries for each user where env is production

I’m developing an application dedicated to generate statistical reports, I would like that user after saving their stat report they save sql queries too. To do that I wrote the following module: ...

热门标签