CarrierWave. Impossible to save the file with STI - ruby-on-rails

Question

I have model Document:
class Document < ActiveRecord::Base
belongs_to :company
validates :name, :presence => true
end
And two classes inherited from Document:
License:
class License < Document
mount_uploader :file, DocumentUploader
end
And Certificate
class Certificate < Document
mount_uploader :file, DocumentUploader
end
And when I try to do current_company.licenses.create(...) or same action for the certificate, always all params are saved, besides file, which always is nil
Also I've tried to mount file inside of Document model... Help me please.
Here is logs:
Started POST "/companies/1/verified" for 127.0.0.1 at Mon Mar 19 09:33:41 +0200 2012
Processing by CompaniesController#verified as HTML
Parameters: {"verified"=>{"certificate"=>{"name"=>"Certificate", "file"=>"test.png"}, "insured"=>"2000000", "suppliers"=>"", "license"=>{"name"=>"License", "file"=>"test.png"}}, "authenticity_token"=>"0hIn41Tjonm/AXZBKM1PE/tjQxJDLqZaojMTHDoZq2k=", "id"=>"1", "utf8"=>"✓", "commit"=>"Update verifications"}
Company Load (0.7ms) SELECT "companies".* FROM "companies" WHERE "companies"."id" = 1 LIMIT 1
(0.1ms) BEGIN
SQL (0.8ms) INSERT INTO "documents" ("company_id", "created_at", "file", "name", "type", "updated_at", "verified") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id" [["company_id", 1], ["created_at", Mon, 19 Mar 2012 07:33:41 UTC +00:00], ["file", nil], ["name", "License"], ["type", "License"], ["updated_at", Mon, 19 Mar 2012 07:33:41 UTC +00:00], ["verified", false]]
(0.6ms) COMMIT
(0.1ms) BEGIN
SQL (0.5ms) INSERT INTO "documents" ("company_id", "created_at", "file", "name", "type", "updated_at", "verified") VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING "id" [["company_id", 1], ["created_at", Mon, 19 Mar 2012 07:33:41 UTC +00:00], ["file", nil], ["name", "Certificate"], ["type", "Certificate"], ["updated_at", Mon, 19 Mar 2012 07:33:41 UTC +00:00], ["verified", false]]
(0.4ms) COMMIT
Redirected to http://localhost:3000/company/profile
Completed 302 Found in 18ms (ActiveRecord: 3.3ms)
Thanks.

Answer 1

Are you sure you've set the form that you've uploading the file with to have a multipart payload?
If not the file won't get sent on submission, and rails will only receive the textual form data. Inside the form_helper tag you'll need to add.
:html => {:multipart => true}