active_storage_problem.rb

# frozen_string_literal: true

gem "bundler", "< 1.16"

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", github: "rails/rails"
  gem "sqlite3"
end

require "active_record"
require "action_controller/railtie"
require "active_storage/engine"
require "minitest/autorun"
require "logger"

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
  end


  create_table :active_storage_blobs do |t|
    t.string   :key,        null: false
    t.string   :filename,   null: false
    t.string   :content_type
    t.text     :metadata
    t.bigint   :byte_size,  null: false
    t.string   :checksum,   null: false
    t.datetime :created_at, null: false

    t.index [ :key ], unique: true
  end

  create_table :active_storage_attachments do |t|
    t.string     :name,     null: false
    t.references :record,   null: false, polymorphic: true, index: false
    t.references :blob,     null: false

    t.datetime :created_at, null: false

    t.index [ :record_type, :record_id, :name, :blob_id ], name: "index_active_storage_attachments_uniqueness", unique: true
  end
end

class Post < ActiveRecord::Base
  has_one_attached :file
end

class BugTest < Minitest::Test

  def url_for(attachment)
    ApplicationController.render(
      inline: "<%= url_for(@attachment) %>",
      assigns: {attachment: attachment}
    )
  end

  def test_this
    post = Post.create!
    payload = {
      io: "iamafile",
      filename: "test.txt",
      content_type: "text/plain"
    }
    post.file.attach(payload)

    assert_equal "",  url_for(post.file)
  end
end