Support alba transform keys in the type generation

[patvice]

Hey! I ran into an issue when trying to get typelizer up and running on an exciting project.

Currently, the Alba serializer plugin doesn't support transform_keys attribute (Alba doc link). This update uses Alba's key transform method to use the specified transform type if present for both the root key and attributes.

Example:

Ruby Resource

class AdminResource
  include Alba::Resource
  include Typelizer::DSL
  
  attributes full_name: [String, true]
  
  transform_keys :lower_camel
end

Generated TS output

// Typelizer digest ebf32772afe4c2bbf03066005cc6884e
//
// DO NOT MODIFY: This file was automatically generated by Typelizer.

type Admin = {
  fullName: string;
}

export default Admin;

[skryukov]

Hey @patvice! Thanks for another great PR!

I'm definitely eager to add this to the gem, but I need some time to evaluate if we want to expose some kind of public API at the plugin level for key transformation. 🤔 I'll try to play with this over the week.

[patvice]

Hey @skryukov! Interesting idea. We originally found this issue when we realized that our typed values were not what our serializer was producing.

However, I know other projects that do the key transforms outside of the serializer to an additional public option would make sense to me.

[skryukov]

Yup, another thing is to ensure we play nice with config.properties_transformer = ->(properties) { ... } (should be fine, just a note to future self), which allows achieving case switching in a "manual mode" right now.

[patvice]

Good point -- I didn't have that option on when I tested my change. I'll make sure that's working.

[patvice]

Just to follow up with this - I was able to do some testing, and it seems like config.properties_transformer = ->(properties) { ... } works as I would have expected. The name is transformed before it's passed properties_transformer, in case the user would like to do something else with the name at that point.

Example of an output of what's passed to properties_transformer my AdminResource example:

[#<struct Typelizer::Property
  name="fullName",
  type=:string,
  optional=false,
  nullable=false,
  multi=false,
  column_name="fullName">]

[patvice]

Oops closed this by mistake

[skryukov]

Ok, I decided to merge it since props transformation might be too specific for each serialization gem/application, so we won't expose that at the plugin level. Thanks for your PR @patvice! I will add some tests and hopefully support for other plugins as well before the next release.