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How works the lists field in the SellIt's models

It's important to allow to the client to select a size, style o color for the item which client wants to purchase. To add these options, i've created the lists field in the SellIt's models, which allows to create a list with new items(could be sizes, colors, styles, etc.) and manage them.

I've explained how to add a new register a new SellIt's model here https://www.midrub.com/articles/set-sellit-model If you're looking at the model structure, you're seeing the fields key which has no value there. 

If you want to add a new field with the lists type, you have to add another array like this:

array(
    'field_slug' => 'unique field type',
    'field_type' => 'lists',
    'field_name' => 'field name displayed to the user',
    'field_instructions' => 'short instructions displayed to the user',
    'field_placeholder' => 'placeholder displayed in the add new item input',
    'field_add_item' => 'text which is showed on the button',
    'required' => 'boolean value'
)