Module transform 

Parse JSON to BSON and back.

Upstream: src/Adapters/Storage/Mongo/MongoTransform.js. It is full of load-bearing special cases, and those special cases are the whole job: the naive transform is trivial and wrong.

The pair implemented here mirrors parseObjectToMongoObjectForCreate and mongoObjectToParseObject, which are the two functions upstream exports and therefore the two this can be differentially tested against. See tests/transform_differential.rs.

Scope is the 0.1.0 field set: String, Number, Boolean, Date, Array, Object, Pointer, ACL, plus the 0.2.0 additions: the $or/$and/$nor query tree, $all, $regex, the update operator set, and Relation fields (which have no column at all).

Functions

bson_document_to_parse_map

Raise a stored sub-document into Parse form, verbatim.

bson_to_parse_value

Raise a stored value. Takes no schema: the stored form is self-describing, which is the asymmetry with lowering, where the schema decides whether a field is a _p_ pointer.

index_key_to_bson

Lower one entry of an index key document.

mongo_object_to_parse

mongoObjectToParseObject.

parse_map_to_bson_document

Lower a Parse map into a stored sub-document, applying no policy.

parse_object_to_mongo_create

parseObjectToMongoObjectForCreate.

storage_key

Keys that are renamed rather than stored under their Parse name (transformKey, MongoTransform.js:7-30). The list is closed: everything else keeps its name, except a declared Pointer field, which takes a _p_ prefix.

transform_update

transformUpdate: lower an update AST into a Mongo update document.

transform_where

transformWhere: lower a query tree into a Mongo filter document.

value_to_bson_for_query

Lower a value for use in a query filter on field.