Add scopes to query by created_at\updated_at to models

created_at_scopes.rb

module Concerns
  module CreatedAtScopes
    extend ActiveSupport::Concern

    included do
      %w(created_at updated_at).each do |prop|
        verb = prop.gsub('_at', '')

        scope "#{verb}_last_h",       lambda { where("#{prop} >=  ?", (Time.now-1.hour).to_s(:db)) }
        scope "#{verb}_last_6h",      lambda { where("#{prop} >=  ?", (Time.now-6.hour).to_s(:db)) }
        scope "#{verb}_today",        lambda { where("DATE(#{prop}) =  ?", Date.today.to_s(:db)) }
        scope "#{verb}_last7d",       lambda { where("DATE(#{prop}) >= ?", (Date.today-7).to_s(:db)) }
        scope "#{verb}_last30d",      lambda { where("DATE(#{prop}) >= ?", (Date.today-30).to_s(:db)) }
        scope "#{verb}_this_month",   lambda { where("DATE(#{prop}) >= ?", Date.today.beginning_of_month.to_s(:db)) }
        scope "#{verb}_last_6m",      lambda { where("DATE(#{prop}) >= ?", (Date.today - 6.months).to_s(:db)) }
      end
    end
  end
end

Cool!
I would add "d" to the last7/last30 methods, so make them clearer.

Thats interesting... should I also turn "hour" and "hours to "h" ?

One thing I would want to do is get all the model's DateTime attributes and automatically scope them.
For example, users have invited_at too...

Any idea how?

columns.select { |c| c.type == :datetime }.collect(&:name).each do

And if your timeframes are not exactly the same for all models you could do:

timeframe_scopes 7.days, 3.hours, 1.month

and parse it on the other side.

Nice.

You can write with the "ago" function to use everything (untested):

scope "#{verb}_last" lambda { |t| 
  t = t.ago
  t = t.beginning_of_day if t < 2.days.ago
  where(prop => t..Time.now) 
}

object.updated_last 5.days
object.created_last 2.weeks

Very nice!
Perhaps we can make it even more dynamic by aliasing the old method_missing and add a new one that checks for Class.updated_#{integer}_#{seconds/minutes/days/months/years}_ago method (then it transforms it into the desired scope) and if it does not find it just call the original method_missing ?