轨道4找到包括

Question

我有这样的关系：

class Organization < ActiveRecord::Base 
    belongs_to :organization_type 
    has_many :organization_type_links 
end 


class OrganizationType < ActiveRecord::Base 
    has_many :organizations 
    has_many :organization_type_links 
end 


class OrganizationTypeLink < ActiveRecord::Base 
    belongs_to :organization 
    belongs_to :organization_type 
end 

，并在表的组织，我有场：organization_type_link_id 表organization_type_links：表organization_type_links organization_type_id

我怎么能选择所有组织，其中它的organization_type_id有一些价值？在Rails 3我知道浩做到这一点...在4

我尝试这样：

Organization.includes(:organization_type_links).where(organization_type_id: params[:id]) 

但这并不取什么，我想看看...

Answer 1

尝试joins代替：

Organization.joins(:organization_type_links).where(organization_type_links: { organization_type_id: params[:id] })