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bamboo's Issues

Validations

Here's what I was very generally thinking with validations:

Declare validations and defaults:

var is_email = function(email) {
  // custom check that an email is valid
};

var Post = Model({
  title: {
    type: 'string',
    required: true,
    max_length: 40,
    default: 'New Post'
  },
  author: {
    name: 'string',
    email: {
      validate: is_email,
      message: 'Please enter a valid email'
    }
  }
});

Errors:

var post = Post();
post.errors; // {}
post.title; // 'New Post'
post.title = '';
post.errors; // {'title': 'title required'}
post.set_default('title');
post.author.email = 'hi';
post.errors; // {'author': {'email': 'Please enter a valid email'}};

Error events could be emitted in the form of 'error property' or 'error object.property', and some kind of templating or form library could take those events and render them.

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