Unable to serialize activestorage filename

[mrahul17]

Hi, first of all I'd like to thank all contributors for making such an awesome gem :)

I've been using it in a project and came across a bug where serialization of filename of an ActiveStorage attachment is failing.

I have a setup like this model

class Foo < ApplicationRecord
 has_many_attached :bars
end

serializer

class FooSerializer < Blueprinter::Base
  association :bars_blobs, blueprint: BarBlobSerializer
end

class BarBlobSerializer < Blueprinter::Base
  field :filename
end

when my controller with the following code is executed

f  = Foo.find_by(id: 1)
f.bars.attach(params[:file])
render json: FooSerializer.render(f)

I get the following error:

    "status": 500,
    "error": "Internal Server Error",
    "exception": "#<ArgumentError: wrong number of arguments (given 1, expected 0)>",
        "Full Trace": [
            {
                "exception_object_id": 70022805390180,
                "id": 0,
                "trace": "activestorage (6.0.3.2) app/models/active_storage/filename.rb:70:in `to_json'"
            },
            {
                "exception_object_id": 70022805390180,
                "id": 1,
                "trace": "/usr/local/lib/ruby/2.6.0/json/common.rb:224:in `generate'"
            },
            {
                "exception_object_id": 70022805390180,
                "id": 2,
                "trace": "/usr/local/lib/ruby/2.6.0/json/common.rb:224:in `generate'"
            },
            {
                "exception_object_id": 70022805390180,
                "id": 3,
                "trace": "blueprinter (0.25.0) lib/blueprinter/configuration.rb:21:in `public_send'"
            },
            {
                "exception_object_id": 70022805390180,
                "id": 4,
                "trace": "blueprinter (0.25.0) lib/blueprinter/configuration.rb:21:in `jsonify'"
            },
            {
                "exception_object_id": 70022805390180,
                "id": 5,
                "trace": "blueprinter (0.25.0) lib/blueprinter/helpers/base_helpers.rb:66:in `jsonify'"
            },
            {
                "exception_object_id": 70022805390180,
                "id": 6,
                "trace": "blueprinter (0.25.0) lib/blueprinter/base.rb:193:in `render'"
            },

The error appears to be because the method defined here https://github.com/rails/rails/blob/0133428ffa09463070e9d2404995b78a6eeda8bb/activestorage/app/models/active_storage/filename.rb#L70 does not accept arguments, which is unlike the usual way to_json methods are redefined. But I am not sure if this an activestorage bug or blueprinter's .

[philipqnguyen]

@light94 What's the exception class and exception message?

[mrahul17]

@philipqnguyen sorry for that, I must have removed it while reducing the length of the trace. I updated the above trace, here is the exception class

    "exception": "#<ArgumentError: wrong number of arguments (given 1, expected 0)>",

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.