pub const DIRECTIVE_ENTITY: &str = "entity";
pub const DIRECTIVE_BELONGS_TO: &str = "belongsTo";
pub const DIRECTIVE_HAS_MANY: &str = "hasMany";
pub const DIRECTIVE_MANY_TO_MANY: &str = "manyToMany";
pub const DIRECTIVE_PRIVATE: &str = "private";
pub const ARG_FIELD: &str = "field";
pub const ARG_THROUGH: &str = "through";