Add extra constraints for field values

[Jotschi]

It should be possible to add custom constraints for field values.

Add a constraints property to field schemas which contains the constraint parameters.

Types

• min, max (for numbers and strings)
• regex (for strings)
• regexAlias (for strings, allows to use regex definitions shipped with mesh: e.g.: email)
• match (constraint to match only a set of defined values)

Number field constraint

{
  "name" : "size",
  "label" : "Size",
  "constraints": {
     "min": 10,
     "max": 100,
     "match": [ 20, 30, 40 ]
  },
  "type" : "number"
}

String field constraint

{
  "name" : "title",
  "label" : "Title",
  "constraints": {
     "min": 10,
     "max": 255,
     "match": [ "Title A", "Title B", "Title C" ],
  },
  "type" : "number"
}

TODOs

• Add validations in order to detect invalid constraints (e.g.: min,max + match makes no sense)

Questions

• How to handle i18n values for match constraints?