ruby on rails - Finding objects using Activerecord with multiple conditions including a range -


i'm building rails app , trying find records in db using activerecord. there multiple models, of one-to-many relationships 1 many-to-many relationship , need able query can use id's various one-to-many models , array many-to-many.

the models follows:

class user < activerecord::base     belongs_to :city     belongs_to :company     belongs_to :certification     has_many :user_certifications     has_many :certifications, :through => :user_certifications end  class certification < activerecord::base     has_many :user_certifications     has_many :users, :through => :user_certifications end  class city < activerecord::base     has_many :users end

i can query like:

user.where(['city_id = 1 , company_id = 3'])

or using join , individual certification

user.joins(:certifications).where(['city_id = 1 , company_id = 3 , certification_id = 5'])

but since user can have multiple certifications, need able search city 1, company 3, , certifications 5 + 6. ideas?

you looking in clause:

user.joins(:certifications).where(['city_id = 1 , company_id = 3 , certification_id in (5,6)'])

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