CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4activerecord
user626511
user626511

Reputation:

Finding records where NONE of the record's association attribute is of a given value

class Project
      has_many :quotes
      scope :available, ->(business_id) { joins(:quotes).where.not(quotes: { business_id: business_id }) }
      scope :active, ->(business_id) { joins(:quotes).where(quotes: { business_id: business_id }) }
end

class Quote
      belongs_to :project
end

Hi, I'm trying to define an available scope which returns a relation of Project records which don't have a Quote for a given business_id. I tried using the above scope, but it's returning an empty relation?

A similar active scope seems to work fine. The only difference here is the .not() clause.

Any ideas? Do I have to write raw SQL for this?

Upvotes: 1

Views: 160

Answers (1)

David Aldridge
David Aldridge

Reputation: 52396

This ought to do it.

  scope :available, ->(business_id) {where.not(Quote.where("quotes.project_id = projects.id and quotes.business_id = ?", business_id).exists)}

Upvotes: 1

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