Rails - Sort by join table data

Question

I\'ve got a RoR project in the works. Here are the applicable sections of my models.

Home

has_many :communities, :through => :ava         


        

Answer 1

Another way to achieve this:

scope :ordered, -> { includes(:availabilities).order(Availability.arel_table[:price]) }

You can also specify ASC direction with

scope :ordered, -> { includes(:availabilities).order(Availability.arel_table[:price].asc) }

DESC:

scope :ordered, -> { includes(:availabilities).order(Availability.arel_table[:price].desc) }

Using arel_table on ActiveRecord model makes you save against scenario when table name changed (but it happens very rarely).

Note that it is nice to add main_table#id for determinate sorting.

So final version would be:

scope :ordered, -> {
  includes(:availabilities).
    order(Availability.arel_table[:price].asc, order(Home.arel_table[:id].asc)
}