plan to develop a feature about 'default value for optional key'?

[reedboat]

No description provided.

[keleshev]

Hm... interesting. Something like:

Schema({'foo': Or(str, Default('bar'))})

or maybe:

Schema({'foo': Or(str, default='bar')})

What do you think?

[keleshev]

Or maybe something like:

>>> from schema import Optional
>>> Schema({'name': str,
...         Optional('occupation', default='dentist'): str}).validate({'name': 'Sam'})
{'name': 'Sam', 'occupation': 'dentist'}

What do you think?

[reedboat]

I have implemented the second idea based on your program, but I like the first more. :)

[Rogdham]

I see a problem here with your proposals: you are defining the default value in the key part.

The problem is visible when keys are something like int for example.

Trying to find an API… tell me what you prefer! (and they are not to be exclusive)

>>> Schema({Optional(int, default=42): Default(str, 'The answer')}) # option 1
>>> Schema({Optional(int, default=42): Or(str, Default('The answer'))}) # option 2
>>> Schema({Optional(int, default=42): Or(str, default='The answer')}) # option 3

I am for option 3, as it makes the default argument uniform with what is in Optional.

Also, in case Optional has no default argument, I propose to create the default as followed:

• if the first argument is of type type, use its default value (e.g. Optional(int) would be the same as Optional(int, 0) as int() is 0)
• else try to find a .default attribute in the first argument (e.g. for Optional(Use(…)))
• and if it fails, use the first argument directly (e.g. Optional(42) would be the same as Optional(42, default=42)

Tell me if it makes sense, or if you have any other idea.

[Rogdham]

I tried to implement the third API, and I added a Default class as well, because it made sense.

I let you go and see #19 if you want to give it a try and comment there ;-)

[sjakobi]

As the initial request has been implemented and the discussion has shifted to #19, I believe this can be closed.