ruby on rails - How do you apply limits and ordering to associations? -


i'm trying create query can following,

category has_many dates

  • query takes location , category
  • provides array of categories, ordered number of jobs in category. this, i'm using default_scope { order(jobs_count: :desc) } in category model, jobs_count counter.

in each category query provides array of jobs

  • jobs ordered boolean associated attribute order.featured, date (order belongs_to job)
  • only shows jobs attribute: open: true. can done scope.
  • only shows jobs near location if location present. requires call of class method job.within()
  • shows 20 if no category has been set. proving difficult.

is possible in 3 calls database?

attempt @ solution

at high level, first find find jobs in right area, attribute open: true

if need show 20 jobs per category, group jobs category using ruby's group_by, attempt order them correctly, remove first 20 in each array.

i take ids of these jobs.

i perform database call category table, category.includes(:jobs).where(jobs: { id: job_ids}). default scopes ensure order correct.

however, i'm getting stuck @ final obstacle! can't seem order jobs come way. default_scope seems being ignored, , don't know how apply order or scope jobs called in category query.

is correct way approach problem? there easier way? jobs.group_by(...) better - seems require passing in raw sql in ruby docs: http://guides.rubyonrails.org/active_record_querying.html#group


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