Thinking sphinx index with Multiple joins and conditions - thinking-sphinx

Question

I have 3 models : Users has_one Service and Users Has_many Phones (verified or not, destroyed or not)
Class Phone < ActiveRecord::Base
belongs_to :user
end
class User < ActiveRecord::Base
has_one :service
has_many :phones
has_many :verified_phones, -> {where('verified_at IS NOT NULL AND destroyed_at IS NULL')}, class_name: 'Phone'
end
class Service < ActiveRecord::Base
belongs_to :user
has_many :phones, through: :user
has_many :verified_phones, through: :user
end
I'd like to define an TS-index on the model Service.
I want an boolean-faceted attribute which represents Service whose user has one or more verified phone.
So after reading this post I tried :
join verified_phones
has 'COUNT(verified_phones.id) > 0', as: :user_phone_verified, type: :boolean, facet: true
but send me the error "Unknown column 'verified_phones.id' in 'field list' " (the same error occured in the post)
Then I tried
join verified_phones
has 'COUNT(phones.id) > 0', as: :user_phone_verified, type: :boolean, facet: true
-> but result are wrong : attribute is true for every user that have a phone, verified or not, destroyed or not.
Then I tried
join phones
has 'COUNT(phones.verified_at IS NOT NULL AND phones.destroyed_at IS NULL) > 0', as: :user_phone_verified, type: :boolean, facet: true
-> same problem : attribute is true for every user that have a phone, verified or not, destroyed or not.
I'm not good with SQL syntax, could anybody help me to solve this ?
Thanks

Answer 1

The second approach is what you're after - even though you're joining on the special association, the table alias will be the table name by default - hence, phones.id.
That said, what's being returned doesn't seem to be right. Perhaps the following instead:
join verified_phones
has "SUM(CASE WHEN phones.id IS NULL THEN 0 ELSE 1 END) > 0",
as: :user_phone_verified, type: :boolean, facet: true

Answer 2

I got it :
I should have been more precise with the syntax of my association definition :
has_many :verified_phones, -> {where('verified_at IS NOT NULL AND destroyed_at IS NULL')}, class_name: 'Phone'
should have been:
has_many :verified_phones, -> {where('phones.verified_at IS NOT NULL AND phones.destroyed_at IS NULL')}, class_name: 'Phone'
My User model has the same attribute "destroyed_at" -> the generated SQL was looking this attribute in the wrong table.
So with this correction both syntax work:
my initial :
join verified_phones
has 'COUNT(phones.id) > 0', as: :user_phone_verified, type: :boolean, facet: true
or the suggested by #Pat :
has "SUM(CASE WHEN phones.id IS NULL THEN 0 ELSE 1 END) > 0",
as: :user_phone_verified, type: :boolean, facet: true
But I'm not very confortable with this because I see possible confusion with this table alias still named "phones". What happen if I need to join in the same index phones and verified_phones?
But for now it solve my problem, so thank you #Pat !