Draft release for v0.19.0

[mcclayton]

0.19.0 - 2019/07/24

• 🚀 [FEATURE] Added ability to specify transformers for Blueprinter views to further process the resulting hash before serialization. #164. Thanks to @amalarayfreshworks.

Readme Section

Transform Classes

---

Blueprinter provides the ability to specify transforms on views, which enable further
processing and transforming of resulting view field hashes prior to serialization.

Use transform to specify one transformer to be included for serialization.
A transformer is a class, extending Blueprinter::Transformer and implementing the transform method.
Whatever is returned from this transform method will end up being the resulting hash passed to serialization.

Example

Create a Transform class extending from Blueprinter::Transformer

class DynamicFieldTransformer < Blueprinter::Transformer
  def transform(hash, object, options)
    hash.merge!(object.dynamic_fields)
  end
end

class User
  def custom_columns
    self.dynamic_fields #which is an array of some columns
  end
  def custom_fields
    custom_columns.each_with_object({}){|col,result|  result[col] = self.send(col)}
  end
end

Then specify the transform to use for the view.

class UserBlueprint < Blueprinter::Base
  fields :first_name, :last_name
  transform DynamicTransformer
end

---