如何检索在特定日期创建的所有记录？

Question

我很困惑时间戳（created_at）和today

我想显示最近7天的报告，包括今天。
该报告显示每天发布的所有评论的数量。

如何修复下面的代码？什么来?????

<% user_ids = User.all %> 
<% commentable = User.base_class.name.to_s %> 

<% check_date = Date.today - 7 %> 

<% 7.times do %> 

    <% @comments_count = Comment.where(:deleted_at => nil, :created_at => , ??????? :user_id => user_ids, :commentable_type => commentable).count %>  

    <%= @comments_count.to_s %> comments posted! on <%= check_date.to_s %> <br /> 

    <% check_date = check_date + 1 %> 

<% end %> 

Answer 1

喜欢的东西：

range = "created_at #{(5.days.ago.utc...Time.now.utc).to_s(:db)}" 
Category.where(:conditions => range) 

你一个很好的参考：Rails/SQl query help: Find all by created_at in past 7 days per each day?

---

对于你的问题：

<% user_ids = User.all %> 
<% commentable = User.base_class.name.to_s %> 

<% 7.times do |i| %> 

    <% check_date = Date.today - i %> 
    <% date_range = "#{(7.days.ago...check_date).to_s(:db)}" %> 

    <% @comments_count = Comment.where(:deleted_at => nil, :created_at => date_range, :user_id => user_ids, :commentable_type => commentable).count %> 

    <%= @comments_count.to_s %> comments posted! on <%= check_date.to_s %> <br /> 

    <% check_date = check_date + 1 %> 

<% end %> 

Answer 2

你应该做这样的事

<% user_ids = User.all %> 
<% commentable = User.base_class.name.to_s %> 

<% dates = (Date.today)..(Date.today - 6) %> 

<% dates.each do |date| %> 

    <% @comments_count = Comment.where(:deleted_at => nil, :user_id => user_ids, :commentable_type => commentable).select{|comment| comment.created_at.to_date == date}.count %>  

    <%= @comments_count.to_s %> comments posted! on <%= date.to_s %> <br /> 

<% end %> 

Answer 3

首先：不要在您的视图中查询，使用控制器来获取数据并将它们传递给视图。如果您打算使用Rails进行开发并遵循原则（在这种情况下为MVC）。

你可以得到所有过去7天的评论：

@comments = Comment.group('date(created_at), user_id') :conditions => { :created_at => 7.days.ago.utc...Time.now.utc } 

然后在您的视图：

<% @comments.each do |date, count| %> 

<%= date %> 
<%= count %> 

<% end %> 

注：我没有测试过的代码