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Add README example for building error messages #123

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Add README example for building error messages #123

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15 changes: 15 additions & 0 deletions README.md
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Expand Up @@ -40,6 +40,21 @@ validate('presence', 'foo', { presence: true });
validate('length', 'foo', { min: 1 });
```

### Messages
When validation fails, you can build the error message manually.

```js
import messages from 'ember-validators/messages';
import validateLength from 'ember-validators/length';

const options = { min: 5 };
const result = validateLength('foo', options);

const errorMessage = messages.getMessageFor(result.type, { ...options, description: 'Page title' });

alert(errorMessage); // "Page title is too short (minimum is 5 characters)"
```

## Validator Method Signature

Each validator has the following signature:
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