Validation rules for object properties

[Patrik Polakovic]

Hi, I there a possibility to have object properties from specified enumeration set?

Something like this - not working example:

// +kubebuilder:validation:Enum=apple;banana;pear
type MyKey string

type Mapping {

    Fruit map[MyKey]string `json="fruit"`

}

Thank you

[Joel Speed]

Hey Patrik,

What you want to achieve is possible, but you have to approach it in a slightly different way.

Kube API conventions recommend against using `map` types within APIs, instead you use a list and set some special keys on it, that make it behave like a map.

So the API type that you’d want for this would look something like:

// +kubebuilder:validation:Enum:=Apple;Pear;Banana

type FruitType string

type FruitSpec struct {

  Fruit FruitType `json:"fruit”`

  // Add other fields as required

}

type Parent struct {

  // +listType=map

  // +listMapKey=fruit

  Fruits []FruitSpec

}

Then, when you try to create items in the Fruits list, the listType will validate that each combination of `listMapKey` is unique within the list, and that your `Fruit` values match only those within your enumerated list.

Hope that helps,

Joel

Joel Speed

He/Him/His

Principal Software Engineer, OpenShift

Red Hat

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