If you want to collect data in the form of arrays within your forms, you can use the multiple attribute on the relevant field. This enables the form to accept and output data as arrays, allowing users to submit multiple entries in a single field. When the multiple attribute is active, each value entered will be collected into an array, providing a structured format that can streamline data handling, especially when working with multiple selections or repeated input fields.

Keep in mind that the checkbox_group component represents a group of checkboxes, so within a form, it will return a list of checked items. In contrast, using the checkbox component individually will return a boolean value indicating whether it’s checked or not. Inside checkbox_group , the multiple property is set to true by default, meaning it will return a list of selected values and keys. This setup allows users to select multiple options, with each selection stored in a structured list format for easy processing in your form.

The checkbox_check function is tailored to handle checkbox selections in forms by checking if a specific value is present in the form’s parameters. For instance, using checkbox_check(:list, {:hobbies, "reading"}, @form) tracks whether "reading" is among the selected hobbies. If no user selection is found in the parameters, it defaults to checking the initial form data. This flexibility allows checkbox_check to support multiple checkbox options, adapting to dynamic data structures in real-time validations and preset values. See the module documentation for more configuration details.