Find multiple records with ActiveRecord's Model.find

This is something cool that it took me over a year of coding in Ruby to find out. If I have a comma separated list or an array of IDs, I can find all of the records in one call:

  Model.find(ids)

Caveat: This will give the objects back in an array. However, if you want to run ActiveRecord methods on this, better to use this:

  Class.where(id: ids)

Then, you can chain methods like so:

  Class.where(id: ids).update_all(updated_at: Time.now)

Be careful! update_all does NOT run validations. But it is incredibly useful for updating several records without instantiating all of the objects. This is a straight sequel query, hence no callbacks.