Validate only on update and not create

[Zachary Dixon]

I have a model where a few attributes are required only after the record has been created. It's created in the backend and and the client has no way of creating them. Is there a way to create this validation since presence: true seems like it validates on any kind of save.

[Zachary Dixon]

I should also add that I need to create these on the demo version which uses LocalStorage, otherwise I won't have the problem on the production app that uses a Rails API

[Robert Mosolgo]

You could try conditional validation:  http://batmanjs.org/docs/api/batman.model_validations.html#conditional_validation

For example,

@validate "name", presence: true, if: "id"

where presence of "id" shows that it has already been created. You could define another accessor and use that instead of "id" if you need a more robust test. 

In the long run, it would be nice to imitate Rails' `validates ... on: ` in batman.js!

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[Zachary Dixon]

Yeah the @validate on: would definitely be nice.

I tried:

@validate 'street_address_1', 'city', 'state', 'zip_code', if: "id", presence: true

but it doesn't seem to be working, even in the callback on the create I'm seeing 4 errors and the record.get('id') returns undefined.

[Robert Mosolgo]

Maybe related: if/unless validators were failing with multiple keys: https://github.com/batmanjs/batman/pull/1058

You could try splitting them up to separate `@validate` calls to work around that bug, or just use a full-on custom validation:

http://batmanjs.org/docs/api/batman.model_validations.html#custom_validation