Module infer 

Type inference, name validation, and default columns.

Upstream: getType and getObjectType (SchemaController.js:1555-1640), plus classNameIsValid and fieldNameIsValid (:446-480).

Inference is what makes Parse’s schema implicit: the first write that mentions a field decides its type forever. Everything downstream, including the error a client sees on the second write, follows from getting this exactly right.

Constants

DEFAULT_COLUMNS

The four columns every class has (defaultColumns._Default).

INVALID_COLUMNS

Field names no class may use (invalidColumns, SchemaController.js:163).

SYSTEM_CLASSES

Classes Parse defines itself (systemClasses, SchemaController.js:165-176).

USER_COLUMNS

The additional default columns of _User (defaultColumns._User).

VOLATILE_CLASSES

Classes held in memory rather than loaded from _SCHEMA (volatileClasses, SchemaController.js:178-187).

Functions

class_name_is_valid

Is this a class a client may address?

default_columns_for

The additional default columns of one class, or empty for a class that has none.

field_name_is_valid

Field names a client may not use at all.

field_name_is_valid_for_class

Additionally refuses the default columns, which a client cannot redefine.

infer_op_type

Infer a field type from an operation, as getObjectType’s __op arm does (SchemaController.js:1634-1655).

infer_type

Infer a field type from a value, as getType does.

invalid_class_name_message

invalidClassNameMessage (SchemaController.js:483-489).

is_default_column

Is this field a default column of this class, counting both _Default and the class’s own?

required_read_columns

Columns that must be present for a read of a class (requiredColumns.read, SchemaController.js:154-156).

required_write_columns

Columns that must be present for a write to a class to be accepted (requiredColumns.write, SchemaController.js:157-160).

schema_mismatch

The INCORRECT_TYPE a client sees when a write disagrees with the stored type.