Add restriction on :bool fields in schema for possible values

[notramo]

Sometimes a checkbox must be checked (ToS, privacy policy, etc.) in order to successfully submit a form. The :bool schema field could utilize a parameter for this to enforce only true or only false values.

[ellmetha]

Sorry for the late answer! Why not use a bool field that is required?

For example:

class MySchema < Marten::Schema
  field :tos, :bool, required: true
end

Validation won't pass unless the value is true. It is worth noting that bool fields don't differentiate between no values and falsey values at the moment.

If you need to enforce only false values, then I'd argue that the field should probably be refactored (renamed) so that you enforce a true value. This can also be achieved with custom code validation rules obviously.