[bug] Default transformer is not available in views

[sanvijay]

Is there an existing issue for this?

• I have searched the existing issues

Is this a regression?

• Yes, this used to work before

Current Behavior

This is the sample blueprint I have

class UserBlueprint < Blueprinter::Base
  transform DefaultTransformer

  view :normal do
    transform ViewTransformer
  end

  view :extended do
    include_view :normal
  end

  association :address, blueprint: AddressBlueprint

  view :without_address do
    exclude :address
  end
end

As per the document, I should be able to see DefaultTransformer, but I don't see it.

For now, I edited the view like below to make it work

view :without_address do
    transform DefaultTransformer

    exclude :address
  end

Expected Behavior

I should see the DefaultTransformer inside the view.

Steps To Reproduce

This is the sample blueprint I have

class UserBlueprint < Blueprinter::Base
  transform DefaultTransformer

  view :normal do
    transform ViewTransformer
  end

  view :extended do
    include_view :normal
  end

  association :address, blueprint: AddressBlueprint

  view :without_address do
    exclude :address
  end
end

As per the document, I should be able to see DefaultTransformer, but I don't see it.

For now, I edited the view like below to make it work

view :without_address do
    transform DefaultTransformer

    exclude :address
  end

Environment

- OS: MacOS 15.4.1 (24E263)
- Browser Name and version: Chrome
- Ruby Version: ruby-3.2.2

Anything else?

No response

[lessthanjacob]

Hey @sanvijay! Thanks for reaching out!

Could you provide some additional information regarding the issue you're seeing (i.e. what's the output your seeing after calling .render before and after the change)?

I put together a simple example in a similar fashion, and the transformers are working as expected:

class TruncateTransformer < Blueprinter::Transformer
  def transform(hash, _object, _options)
    hash.transform_keys! { |key| key.to_s.split('').first(3).join('') }
  end
end

class DuplicateTransformer < Blueprinter::Transformer
  def transform(hash, _object, _options)
    hash.transform_keys! { |key| key.to_s + key.to_s }
  end
end

class UserBlueprint < Blueprinter::Base
  transform TruncateTransformer

  identifier :id
  field :name

  view :normal do
    transform DuplicateTransformer
  end 

  view :extended do
    include_view :normal

    field :user_access_level
  end

  view :another_view do 
    field :updated_at
  end
end

User = Struct.new(:id, :name, :user_access_level, :updated_at)

# Only runs "TruncateTransformer"
irb(main):039> UserBlueprint.render_as_hash(User.new(1, 'Jake', 3, Time.now))
=> {"id"=>1, "nam"=>"Jake"}

# Runs "TruncateTransformer" then "DuplicateTransformer"
irb(main):040> UserBlueprint.render_as_hash(User.new(1, 'Jake', 3, Time.now), view: :normal)
=> {"idid"=>1, "namnam"=>"Jake"}

# Runs "TruncateTransformer" then "DuplicateTransformer"
irb(main):041> UserBlueprint.render_as_hash(User.new(1, 'Jake', 3, Time.now), view: :extended)
=> {"idid"=>1, "namnam"=>"Jake", "useuse"=>3}

#  Only runs "TruncateTransformer" 
irb(main):042> UserBlueprint.render_as_hash(User.new(1, 'Jake', 3, Time.now), view: :another_view)
=> {"id"=>1, "nam"=>"Jake", "upd"=>2025-04-26 22:15:09.656101 -0400}
irb(main):043>