Relationship field validator, raising a validation error when relationship doesn't have at least one object. Like the isRequired: true on other fields.

• Add validateInput: relationRequiredValidateInput in the hooks of the relationship field

See testSchema/relationshipRequired/index.ts.

On a 1-to-1 or 1-to-many relationship:

• Delete children when parent is deleted
• Do not delete children when they are removed from parent relation

• Use beforeOperationDeleteOne({ ref: "<child ref>" }) for one-to-one relationships and beforeOperationDeleteMany({ ref: "<child ref>" }) for one-to-many relationships
• The ref value must be the same as the ref config of the relationship field
• Add it as a before operation hook to relationship fields you want to cascade delete

See testSchema/cascadeDelete/oneToOne.ts and testSchema/cascadeDelete/oneToMany.ts.

• Add History schema to your lists
• Add the afterOperationSaveHistory hook to any object you want to historize

See testSchema/historized