Question

How i can write where query by two date ranges? The only condition is that this data must be retrieved by one query. Thank you.

UPD: or how to union 2 queries in one collection? not array

Answer 1

You can easily or the two ranges:

Post.all.
     or(:created_at.gt => Time.now - 3.months, :created_at.lte => Time.now - 2.months).
     or(:created_at.gt => Time.now - 1.month, :created_at.lte => Time.now)