lektor-website/content/docs/models/flow/contents.lr

title: Flow Block Models
---
summary: Explains how to model flow blocks.
---
body:

To use [Flow :ref](../../content/flow/) you need to define flow block models.
If you are not familiar with Flow yet, you should read the [Introduction
Documentation](../../content/flow/) to Flow first.

## Defining Models

Flow block models work pretty much exactly the same as [Regular Models
:ref](../).  The differences are mostly minor and of cosmetic nature.  They
are stored in the `flowblocks/` folder and are ini files just like models.

Instead of using `[model]` as section, the section is called `[block]`.

Here a very basic flow block model `flowblocks/text.ini`:

```ini
[block]
name = Text Block
button_label = Text

[fields.text]
label = Text
type = markdown

[fields.class]
label = Class
type = select
choices = default, centered
choice_labels = Default, Centered
default = default
```

This should be self explanatory.  One thing that is different about blocks
compared to regular models is that they support the `button_label` attribute
which an be used to customize the label of the button that adds blocks to
a flow.

## Templates

Now that we have a model for our flow block, we need to create a template
for it.  When a flow block is added to a Flow, it will automatically
render it by default through the template `blocks/NAME.html` (so in our
case `blocks/text.html`).  Here is a suitable template for this:

```html+jinja
<div class="text-block text-block-{{ this.class }}">
  {{ this.text }}
</div>
```

If you need to access the page the flow is used by, you can use the `record`
template variable.