author

type Author struct {
	ID          string `bson:"_id" json:"_id"`
	Name        string `bson:"name" json:"name"`
	DisplayName string `bson:"display_name" json:"display_name"`
}

type Provider interface {
	Pipeline() []bson.M
	PipelineForField(field string) []bson.M
	GetDisplayNameQuery(field string) bson.M
	// AddAuthorStr converts object result after Pipeline() into string author with display_name by default
	AddAuthorStr(field string) bson.M
}

type Role struct {
	ID   string `bson:"_id" json:"_id"`
	Name string `bson:"name" json:"name"`
}