Rails Devise - Update User with Associated Model - ruby-on-rails

Question

Good day,
I have a devise users model and in edit user page I want to add a custom field called "add verification documents" which takes in multiple documents(pdf's) that are uploaded in edit user page. A User can upload multiple documents.
# user.rb
class User < ActiveRecord::Base
has_many :verification_documents
end
# routes.rb
devise_for :users,
path: '',
path_names: {sign_in: 'login', sign_out: 'logout',sign_up: 'sign-up', edit: 'profile'},
controllers: {
omniauth_callbacks: 'omniauth_callbacks',
registrations: 'registrations'
}
My Requirement is similar to
Rails Devise - Register User with Associated Model ,
But Instead of address attributes, here I want to upload multiple verification verification documents to the verification_documents model during update action of the devise user model.
# views/devise/registrations/edit.html.erb
<div class="row">
<%= form_for(resource, as: resource_name,
url: registration_path(resource_name),
html: { method: :put },
multipart: true) do |f| %>
<div class="form-group">
<%= f.text_field :fullname, autofocus: true,
placeholder: "Full Name *", class: "form-control" %>
</div>
<div class="form-group">
<%= f.email_field :email, placeholder: "Email *",
class: "form-control" %>
</div>
<span class="btn btn-default btn-file btn-green pad_small">
Upload Verification Documents
<input type="file" accept="application/pdf" name="input-file-preview"/>
<%= file_field_tag "verification_documents[]", type: :file, multiple: true %>
</span>
<div class="actions">
<%= f.button "Save", class: "btn btn-green pad_small" %>
</div>
</div>
# verification_document.rb
class VerificationDocument < ActiveRecord::Base
belongs_to :user
has_attached_file :verification_documents
validates_attachment_content_type :verification_documents,
{ :content_type => %w( application/pdf ) }
end
Is it possible to update something like below in RegistrationsController as ?
# RegistrationsController < Devise::RegistrationsController
def update
if #user.update(user_params)
if params[:verification_documents]
params[:verification_documents].each do |doc|
#user.verification_documents.create(verification_documents: doc)
end
end
redirect_to root_path, notice: "Updated..."
else
render :edit
end
end
In application_controller.rb I have,
def configure_permitted_parameters
devise_parameter_sanitizer.permit(:sign_up,
keys: [:fullname, :subscribe])
devise_parameter_sanitizer.permit(:account_update,
keys: [:fullname, :reset_password_token, :verification_documents])
end
Any Help is Highly Appreciated.Thanks in Advance!
UPDATE 1
I have added this to the Registrations Controller
def update
super
#user = User.find(current_user.id)
if params[:user][:verification_documents]
params[:user][:verification_documents].each do |doc|
#user.verification_documents.create(verification_documents: doc)
end
puts "document saved"
else
puts "not saved"
end
end
I tried to change the user phone number and upload the verification_documents (pdf's) in the users edit page.The values of devise user model Attribute's were successfully updated(The phone number is an attribute of user model).But the values for the verification_document model attributes are not saved.
phone number is updated but the verification_documents were still not saved
Log:
Processing by RegistrationsController#update as HTML
Parameters: {"utf8"=>"▒~\~S", "authenticity_token"=>"Xic+IFWWdzK4KaFzgnVzsOjMDPDaznJBjosj69khn3AfhrJr0mWsJrobK/mWHWiaANFqQAKj7wUPRYslfJZoPw==", "user"=>{"fullname"=>"Mohan Krishna Gangarapu", "email"=>"mohankrish93#gmail.com", "alternate_email"=>"", "business_name"=>"", "location"=>"", "phone_number"=>"9999999999", "alternate_phone_number"=>"", "dealer"=>"0", "fleet_manager"=>"0", "description"=>"", "url"=>"", "current_password"=>"[FILTERED]", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "deactivate"=>"false"}, "verification_documents"=>[#<ActionDispatch::Http::UploadedFile:0x007f1412365420 #tempfile=#<Tempfile:/tmp/RackMultipart20170411-23997-11lrzwz.pdf>, #original_filename="pdf-test.pdf", #content_type="application/pdf", #headers="Content-Disposition: form-data; name=\"verification_documents[]\"; filename=\"pdf-test.pdf\"\r\nContent-Type: application/pdf\r\n">, #<ActionDispatch::Http::UploadedFile:0x007f14123653f8 #tempfile=#<Tempfile:/tmp/RackMultipart20170411-23997-e1grsp.pdf>, #original_filename="pdfurl-guide.pdf.pdf", #content_type="application/pdf", #headers="Content-Disposition: form-data; name=\"verification_documents[]\"; filename=\"pdfurl-guide.pdf.pdf\"\r\nContent-Type: application/pdf\r\n">], "button"=>""}
^[[1m^[[36mUser Load (0.2ms)^[[0m ^[[1mSELECT `users`.* FROM `users` WHERE `users`.`id` = ? ORDER BY `users`.`id` ASC LIMIT 1^[[0m [["id", 686]]
^[[1m^[[35mUser Load (0.4ms)^[[0m SELECT `users`.* FROM `users` WHERE `users`.`id` = ? LIMIT 1 [["id", 686]]
Unpermitted parameters: business_name, location
^[[1m^[[36mSQL (0.1ms)^[[0m ^[[1mBEGIN^[[0m
^[[1m^[[35mSQL (0.3ms)^[[0m UPDATE `users` SET `phone_number` = ?, `deactivate` = ?, `updated_at` = ? WHERE `users`.`id` = ? [["phone_number", "9999999999"], ["deactivate", 0], ["updated_at", "2017-04-11 05:32:57"], ["id", 686]]
^[[1m^[[36m (1.8ms)^[[0m ^[[1mCOMMIT^[[0m
Redirected to http://104.251.212.100:3000/
Completed 302 Found in 17ms (ActiveRecord: 3.6ms)
Started GET "/" for 156.73.67.6 at 2017-04-11 05:32:57 -0500
Cannot render console from 156.73.67.6! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
Processing by PagesController#home as HTML