Translation of this issue:

Existing Component

yes

Component Name

el-form

Description

Without model in validator function, I have to use this.xxx or $refs to access the model itself. It's inconvenient when I use config-like style to write a form validation.Especially when the config and the form component codes are in different repos which communicate with server's json response.

E.g
in repo1 there's component's code:

<el-form>

<el-input/>
</el-form>

` ` ` `
in repo2 there's form items' config:

```javascript
{

label: 'xxx',
rule: [

validator(rule, value, callback) {
// how to access another field's value? Can I still use this?

}
]

}
` ` ` `

I cannot access other fields in the scene like this.
Thank you.

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