Rails ActiveStorage Error - MessageVerifier-InvalidSignature - ruby-on-rails

Question

I'm working on a project that requires an ActiveStorage has_many_attached :photos situation on a Location model.
I have the code set up below, but when attempting to upload a form, I receive the following error:
ActiveSupport::MessageVerifier::InvalidSignature in
LocationsController#attach_photo
Is this the way to "add" a file to the set of attachments for a particular parent record (i.e: a Location record)?
Location Model
class Location < ApplicationRecord
...
has_many_attached :photos
...
end
Locations Controller
class LocationsController < ApplicationController
...
def attach_photo
#location = Location.find(params[:id])
#location.photos.attach(params[:photo])
redirect_to location_path(#location)
end
...
end
View
<%= form_tag attach_photo_location_path(#location) do %>
<%= label_tag :photo %>
<%= file_field_tag :photo %>
<%= submit_tag "Upload" %>
<% end %>
View
resources :locations do
member do
post :attach_photo
end
end

Answer 1

Make sure to add multipart: true in form_tag. It generates enctype="multipart/form-data".
form_tag by default not responsible for it, must have it (if attaching a file).
multipart/form-data No characters are encoded. This value is required
when you are using forms that have a file upload control
Form:
<%= form_tag attach_photo_location_path(#location), method: :put, multipart: true do %>
<%= label_tag :photo %>
<%= file_field_tag :photo %>
<%= submit_tag "Upload" %>
<% end %>
Also:
Change post to put method, We are updating not creating Idempotency
resources :locations do
member do
put :attach_photo
end
end

Answer 2

You need to assign the signature (in params[:signed_blob_id]) to the instance as the example from the docs illustrates.
So, like this:
#location.photos.attach(params[:signed_blob_id]) # Signed reference to blob from direct upload

Answer 3

I solved this issue using this
def user_params
params.permit(
:id, :name, :email, :username, :country, :avatar, :id_number, :license_number
).select {|x,v| v.present?}
end
Looks like the empty value is causing the issue "avatar"=>""
"id_number"=>"234545", "license_number"=>"234545", "avatar"=>""
My model
class User < ApplicationRecord
has_one_attached :avatar

Answer 4

Rails Active Storage + React Native + React Native debugger with Network Inspect Enabled may cause this error.
If you're using React Native debugger with Network Inspect Enabled, file uploading might not be working because of this known issue: Formdata sends [object object] in request.
Turn off Network Inspect when you're using React Native debugger. You can inspect network payload with Reactotron instead.