搜索以小时为整数的数据库池

Question

我有一个注册数据库池，其中包含电子邮件、ip、created_at 等属性，我想根据 Time.now 中的小时数进行动态搜索，例如搜索 2 小时前的注册记录，没有对这些时间进行硬编码，但我的解决方案无效且有问题。我怎样才能做到这一点？下面是我做的烂摊子：

traffics_controller.rb

class TrafficsController < BaseController
  def show
    @search_term = params[:search_term]
    @traffic =
        if params[:search_term] == 'time_calculated'
          SignupHistory.time_calculated
        else
          SignupHistory.all 
        end
  end
end

型号

class SignupHistory < ActiveRecord::Base
  def self.time_calculated
    where('created_at > ?', Time.now - "#{time_difference}".hour)
  end
end

show.html.slim

# search form rows
.row
  .panel.panel-primary
    .panel-heading
      span = t('.search')
    .panel-body
      = form_tag admin_statistic_traffics_path, method: :get
        .col-xs-4 = text_field_tag :search_term, @search_term
        .col-xs-12.col-xs-offset-1 = submit_tag 'Search'
# Table rows
.row
  .panel.panel-primary
    .panel-heading
      span = t('admin_header.traffics')
    .panel-body
      = table_for(@traffic, class: 'table table-condensed table-hover') do |t|
        - t.column :id, 'S/N', class: 'col-xs-1'
        - t.column :email, 'Email', class: 'col-xs-2'
        - t.column :created_at, 'Signed in Date', class: 'col-xs-3' do |x|
          = x.created_at.strftime('%B %e, %Y at %I:%M %p')
        - t.column :login_location, 'Login Location', class: 'col-xs-3'

我希望能够在搜索字段中输入 1 并搜索以提取 1 小时前使用 created_at 字段创建的 table 中的记录。但它不起作用。任何帮助将不胜感激。

Answer 1

一个非常简单的解决方案可能是不使用字符串 time_calculated 作为仅 return 最近 SignupHistory 记录的触发器，但实际上该字段中存在一个数字。

# in your controller
def show
  @search_term = params[:search_term]
  @traffic =
      if params[:search_term].to_i > 0
        SignupHistory.time_calculated(params[:search_term])
      else
        SignupHistory.all 
      end
end

# in your model
def self.time_calculated(number)
  where('created_at > ?', number.to_i.hours.ago)
end

搜索以小时为整数的数据库池

searching a pool of database with hours as integer

ruby

ruby-on-rails

ruby-on-rails-4