Search for database objects created on a specific day? - sql

Question

I want to query my db for objects of an arbitrary model created on a certain day, what's a good way to do this?
In an sql query I used the following to query the objects created yesterday.
where (created_at AT TIME ZONE 'EDT') > (now() AT TIME ZONE 'EDT')::DATE - 1
and (created_at AT TIME ZONE 'EDT') < (now() AT TIME ZONE 'EDT')::DATE
I want to do the same thing in ruby with ActiveRecord calls.
Thanks!

Answer 1

An example, as a scope, for all items that were created today:
scope :created_today, -> { where('created_at between ? AND ?', Time.zone.now.beginning_of_day, Time.zone.now.end_of_day) }
More information at the PostgreSQL site

Answer 2

I would do the cast on the database and select the current date there, instead of doing it with a range. You can do this with DATE(created_at) (Will result in "2013-11-01") Then inject the param in the where:
Model.where("DATE(created_at) = ?", Date.today)
If it's used on more places then one it would be good to create a scope as Morner suggested:
scope :created_today { where("DATE(created_at) = ?", Date.today) }
with name:
scope :created_today_with_name lambda do |name|
where("DATE(created_at) = ? AND name = ?", Date.today, name)
end
or chain it:
scope :created_today_with_name lambda do |name|
where("DATE(created_at) = ?", Date.today).where(name: name)
end
Then call it as:
Model.created_today_with_name('Joe')