Add alias_generator

[Bobronium]

Change Summary

Add Config.alias_generator that provides ability to convert name to alias for each field of model. See docs example:

from pydantic import BaseModel

def to_camel(string: str) -> str:
     return ''.join(word.capitalize() for word in string.split('_'))
 
class Voice(BaseModel):
    name: str
    gender: str
    language_code: str
    
    class Config:
         alias_generator = to_camel

 voice = Voice(Name='Filiz', Gender='Female', LanguageCode='tr-TR')
 print(voice.language_code)
 print(voice.dict(by_alias=True))

  """
 tr-TR
 {'Name': 'Filiz', 'Gender': 'Female', 'LanguageCode': 'tr-TR'}
 """

Related issue number

None

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable
• HISTORY.rst has been updated
  • add alias_provider support #622 by @MrMrRobat

[codecov]

Codecov Report

Merging #622 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #622   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          15     15           
  Lines        2628   2634    +6     
  Branches      516    518    +2     
=====================================
+ Hits         2628   2634    +6

[samuelcolvin]

Otherwise mostly looks good to me.

How do we cope with #624 which I hope to implement soon? Three different functions or the method could alternatively return a 3-tuple? Either of these solutions could be implemented later and would be backwards compatible.

[samuelcolvin]

otherwise LGTM.

[samuelcolvin]

sorry, noticed something else.

[samuelcolvin]

great, thank you very much.