title: F
---
summary: Helper object to refer to fields in query filters.
---
module: lektor.db
---
template_var: F
---
type: class
---
body:

When filtering a [Query :ref](../query/) it's often necessary to refer to a
field of an arbitrary record.  This can be achieved with the `F` object.  Any
attribute of it refers to a field in the record.  To make this clearer, have a
look at the example below.

Accessing an attributes creates an [Expression :ref](../expression/).

## Example

```html+jinja
<ul>
{% for item in this.children.filter(F.status == 'published') %}
  <li>{{ item.title }}</li>
{% endfor %}
</ul>
```