How to get records created at the current month?

  scope :this_month, -> { where(created_at: Time.zone.now.beginning_of_month..Time.zone.now.end_of_month) }

and you can call the scope:

Model.this_month

You need to enclose the where in a lamda as well.

scope :from_this_month, lambda { where("votes.created_at > ? AND votes.created_at < ?", Time.now.beginning_of_month, Time.now.end_of_month) }

Otherwise it may appear to work and your tests will all pass, but if your app runs for more than a month you will start to get incorrect results because Time.now is evaluated when the class loads, not when the method is called.

Correct scope

scope :from_this_month, lambda {where("votes.created_at > ? AND votes.created_at < ?", Time.now.beginning_of_month, Time.now.end_of_month)}

This is because in rails the model names are singular(i.e Vote) and tables created are pural (e.g. votes) by convection

EDIT

This can be written simpler with lambda {where(created_at: Time.now.beginning_of_month..(Time.now.end_of_month))} and we need to use lambda due to the reason given in below comments.

Thanx BroiSatse for reminding :D