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如何将Kaminari分页宝石与Sinatra和Mongoid一起使用?

分类: 技术问答 • 2022-06-01 00:34:45
问题描述：

大概不需要很多配置-文档.宝石似乎不起作用.相关代码:

Presumably, not a whole lot of configuration is required - docs. The gem doesn't seem to work. Relevant code:

宝石文件:

source 'https://rubygems.org'

ruby '2.2.4'

gem 'sinatra'
gem 'thin'
gem 'slim'
gem 'json'
gem 'mongoid'
gem 'kaminari'

web.rb:

require 'sinatra'
require 'json'
require 'mongoid'
require 'kaminari'

# Mongoid class
class Affiliate
  include Mongoid::Document
  field :name, type: String
end

# MongoDB connection info and whatnot
Mongoid.load!('mongoid.yml', :development)

get '/kaminari' do
  puts Affiliate.page(1).count
end

错误:

NoMethodError-Affiliate:Class的未定义方法页面"

NoMethodError - undefined method `page' for Affiliate:Class

答

错误消息指出您无法分班课程.另外，在分页数据集上调用count也不正确.而是，首先向类添加一些选择条件，然后尝试分页结果.关于Mongoid，一个例子是:

The error message states you can't page a class. Also, calling count on paginated data set isn't a correct use. Instead, first add some selection criteria to the class and then try to page the results. With respect to Mongoid, an example would be: 

@paginated_users = User.where(:age.gte => 10).page(10)

默认情况下，kaminari每页返回25个项目，您可以通过添加per(desired number of items per page)这样的方法来更改它，

By default, kaminari returns 25 items per page, you can change that by appending a per(desired number of items per page) method like so, 

@paginated_users = User.where(:age.gte => 10).page(10).per(5)

最后，请确保在相应的视图文件中添加<%= paginate @paginated_users %>(在web.rb中声明的相同变量名，其中包含要在视图中分页的数据集).

Lastly, make sure you add a <%= paginate @paginated_users %> (the same variable name declared in your web.rb that contains the dataset to be paginated in the view) in your corresponding view file.

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