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POIn Rails ActiveRecord, joins does not work with has_and_belongs_to_many in namespaced models
 

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  1. POIn Rails ActiveRecord, joins does not work with has_and_belongs_to_many in namespaced models
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    <p>I have two models in a namespace, a service and an instructor, both which have a many to many relationship with each other, defined through a has_and_belongs_to_many:</p> <pre><code>class Scheduling::Service &lt; ActiveRecord::Base has_and_belongs_to_many :instructors end class Scheduling::Instructor &lt; ActiveRecord::Base attr_accessible :first_name, :last_name has_many :instructor_availabilities scope :of_service, lambda { |service_id| joins(:services).where(:services =&gt; {:id =&gt; service_id})} has_and_belongs_to_many :services, :class_name =&gt; "Scheduling::Service" end </code></pre> <p>In the scope of_service, I want of_service to return all instructors that are associated with a service.</p> <p>However, when running this scope, I get an error:</p> <blockquote> <p>ActiveRecord::StatementInvalid: PG::Error: ERROR: missing FROM-clause entry for table "services" LINE 1: ...."id" = "instructors_services"."service_id" WHERE "services"... ^ : SELECT "scheduling_instructors".* FROM "scheduling_instructors" INNER JOIN "instructors_services" ON "instructors_services"."instructor_id" = "scheduling_instructors"."id" INNER JOIN "scheduling_services" ON "scheduling_services"."id" = "instructors_services"."service_id" WHERE "services"."id" = 107 LIMIT 1</p> </blockquote> <p>Where it seems to be going wrong is that its joining a table called instructors_services (that table doesnt exist), ignoring the namespace in the related model. It should be joining a table called scheduling_instructors_services, which is consistent with the namespace.</p>
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