If Policy

When a given collection uses a named_filter, you can use If to make items
matching a given filter use one policy, and items not matched by a given filter
use a different policy.

Constructor params

• collection_name: string - due to implementation complexities, you have to pass the collection name to this policy. It's the name of the collection that this policy is attached to.
• special_filter_name: string - which filter from the collection to use when segmenting the items
• when_true: Policy - Policy to use when the special filter matches a given item

• when_false: Policy - Policy to use when the special filter doesn't match a given Item

Example

The below app will make non-negative number public, but negative numbers will
only be visible to logged-in users.

class extends App {
		collections = {
			...App.BaseCollections,
			numbers: new (class extends Collection {
				fields = {
					number: new FieldTypes.Int(),
					number_str: new FieldTypes.Text(),
				};
				named_filters = {
					positive: new Matches("numbers", {
						number: { ">": 0 },
					}),
					negative: new Matches("numbers", {
						number: { "<": 0 },
					}),
				};
				defaultPolicy = new Policies.If(
					"numbers",
					"negative",
					Policies.LoggedIn,
					Policies.Public,
				);
			})(),
		};
	};