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One question related with feature conditions, does it support to use nested json field or even array? Like we have the user attribute as
```{ address: {state: 'CA'}}```
And we can add `address.state` in the JSON rule

yes, that's supported.  Under Settings-&gt;Attributes, you can define attributes with dot notation.  So if you add an attribute `address.state` as a string, it should show up in the dropdown when adding conditions.

Cool! so it support the lodash syntax right?

arrays are a little trickier to deal with than nested objects.  If you want at least one array element to match a condition, you can use `$elemMatch` .  For example, if you have an array of address objects instead of just a single address:
```{
  "addresses": {
    "$elemMatch": {
      "state": "CA"
    }
  }
}```

interesting, I will check with MongoDB query syntax. Thanks~