Added only to Model

[JarriqTheTechie]

Added

• Adds only method to model class. This method allows you to get a subset of the model's attributes.

Usage

User.first_or_create(
      {"email": "abc@123.com"},
      {"email": "abc@123.com", "password": "password123"}
  ).only([
      "id",
      "email",
  ])

this would return the following

{'id': 1, 'email': 'abc@123.com'}

In addition to the above usage, you can also use this as a way to remap data. We can alias attributes so that the results can match its destination. Example usage

User.first_or_create(
      {"email": "abc@123.com"},
      {"email": "abc@123.com", "password": "password123"}
  ).only([
      "id as UserIdentifier",
      "email as EmailAddress",
  ])

this would return the following

{'UserIdentifier': 2, 'EmailAddress': 'abc@123.com'}

[josephmancuso]

made a small change here if you just want to pull 1 column by not needing to pass a list

User.first_or_create(
      {"email": "abc@123.com"},
      {"email": "abc@123.com", "password": "password123"}
  ).only("email")

[josephmancuso]

and i added tests