多态模型和has_many通过

Question

I have a polymorphic model Document and multiple models with documents linked. One of which the CustomerPlan model that has_many documents, as: :linkable . This works fine.

In addition I have a Company model that has_many :customer_plans . As such an instance of Company should also have many documents. How do I properly set up the has_many relation between the Company model and the Document model?

Currently:

Schema:

  create_table "documents", force: :cascade do |t|
    t.json     "links"
    t.integer  "linkable_id"
    t.string   "linkable_type"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

  add_index "documents", ["linkable_type", "linkable_id"], name: "index_documents_on_linkable_type_and_linkable_id", using: :btree

Models:

class Document < ActiveRecord::Base
  belongs_to :linkable, polymorphic: true
  belongs_to :user
  belongs_to :company

  mount_uploaders :links, DocUploader
end



class CustomerPlan < ActiveRecord::Base
  belongs_to :company
  has_many :documents, as: :linkable
  accepts_nested_attributes_for :documents
end

class Company < ActiveRecord::Base
  has_many :customer_plans
  has_many :documents
end

Answer 1

According to my understanding of your question,

if Company has_many :customer_plans and CustomerPlan has_many :documents , then you could have Company has_many :documents, through: :customer_plans

Answer 2

I believe you should be able to do something like:

class Company < ActiveRecord::Base
  has_many :customer_plans
  has_many :documents, through: :customer_plans
end

UPDATE

based on the new information of company having other documents through other associations, I'd probably go about it this way:

class Company < ActiveRecord::Base
  has_many :customer_plans
  has_many :customer_plan_documents, through: :customer_plans, source: :documents
  # you can later do other document associations here
end

Let me know if that works