Validation

Collection.validate(data, /, *[, cast, eager])	Validate that a set of data frames satisfy the collection's invariants.
Collection.filter(data, /, *[, cast, eager])	Filter the members data frame by their schemas and the collection's filters.
Collection.is_valid(data, /, *[, cast])	Utility method to check whether validate() raises an exception.
Collection.cast(data, /)	Initialize a collection by casting all members into their correct schemas.
filter()	Mark a function as filters for rows in the members of a collection.
require_relationship_one_to_one(lhs, rhs, /, ...)	Express a 1:1 mapping between data frames for a collection filter.
require_relationship_one_to_at_least_one(...)	Express a 1:{1,N} mapping between data frames for a collection filter.