Problems with select field

For some reason the selected_types select field in a blueprints file won't save to the config file. This is part of the blueprints file:

        media_types:
          type: list
          label: Media Types
          fields:
            .name:
              type: text
              label: Name
              validate:
                required: true
            .selected_types:
              type: select
              size: long
              classes: fancy
              label: File types
              help: 'Select file types belonging to this group'
              multiple: true
              default: jpg
              options:
                jpg: 'jpg'
                jpeg: 'jpeg'
                png: 'png'

When saved selected_types appears to be saved as an empty string:

media_types:
  -
    name: Images
    selected_types: ''

I must be overlooking something but I can't figure out what.

@bleutzinn, If you are overlooking something, then so am I...

Some observations:

• The select field works fine when you comment out 'multiple'
• When replacing it with a 'selectize' field, it also works.

My guess is there is something wrong with the field itself. Also see this issue at Github.

Thanks for the investigation.

I managed to track the problem down to the Grav core, in the 'filterArray' function in /system/src/Grav/Common/Data/BlueprintSchema.php line 170 to be specific.

When I do a dump($data) before this function is called (at line 87 of the same php file) the field is still an array. After the 'filterArray' function it has suddenly become an empty string.

The 'filterArray' function performs field validation and uses recursion to handle nested fields. This is where things go wrong. What exactly remains a mystery to me though.

Thank you for digging into this and providing a solution. I tested with validate.type: array and indeed it's working. What a great relief!

Of course I will make a PR towards the documentation. Again thanks!

PS a PR is currently pending.