How can I get url of my attachment stored in active storage in my rails controller
Use the method rails_blob_path
for attachements in a controller and models
For example, if you need to assign a variable (e.g. cover_url
) in a controller, first you should include url_helpers
and after use method rails_blob_path
with some parameters. You can do the same in any model, worker etc.
Complete example below:
class ApplicationController < ActionController::Base
include Rails.application.routes.url_helpers
def index
@event = Event.first
cover_url = rails_blob_path(@event.cover, disposition: "attachment", only_path: true)
end
end
Sometimes, e.g. an API needs to return the full url with host / protocol for the clients (e.g. mobile phones etc.). In this case, passing the host parameter to all of the rails_blob_url calls is repetitive and not DRY. Even, you might need different settings in dev/test/prod to make it work.
If you are using ActionMailer and have already configuring that host/protocol in the environments/*.rb you can reuse the setting with rails_blob_url
or rails_representation_url
.
# in your config/environments/*.rb you might be already configuring ActionMailer
config.action_mailer.default_url_options = { host: 'www.my-site.com', protocol: 'https' }
I would recommend just calling the full Rails.application.url_helpers.rails_blob_url
instead of dumping at least 50 methods into your model class (depending on your routes.rb), when you only need 2.
class MyModel < ApplicationModel
has_one_attached :logo
# linking to a variant full url
def logo_medium_variant_url
variant = logo.variant(resize: "1600x200>")
Rails.application.routes.url_helpers.rails_representation_url(
variant,
Rails.application.config.action_mailer.default_url_options
)
end
# linking to a original blob full url
def logo_blob_url
Rails.application.routes.url_helpers.rails_blob_url(
logo.blob,
Rails.application.config.action_mailer.default_url_options
)
end
end