mongo.bson.iterator.value: Return the value of the field pointed to by an iterator
In jonkatz2/rmongodb: R-MongoDB driver

Description Usage Arguments Value See Also Examples

Return the value of the field pointed to by a mongo.bson.iterator.

1	mongo.bson.iterator.value(iter)

iter

A mongo.bson.iterator.

The value of the field pointed to by iter.

This function returns an appropriate R object depending on the type of the field pointed to by the iterator. This mapping to values is as follows:

`mongo.bson.eoo`	0L
`mongo.bson.double`	A double
`mongo.bson.string`	A string
`mongo.bson.object`	(See below).
`mongo.bson.array`	(See below).
`mongo.bson.binary`	A raw vector. (See below).
`mongo.bson.undefined`	A mongo.undefined object
`mongo.bson.oid`	A mongo.oid object
`mongo.bson.bool`	A logical
`mongo.bson.date`	A "POSIXct" class object
`mongo.bson.null`	NULL
`mongo.bson.regex`	A mongo.regex object
`mongo.bson.dbref`	Error! (deprecated -- see link)
`mongo.bson.code`	A mongo.code object
`mongo.bson.symbol`	A mongo.symbol object
`mongo.bson.code.w.scope`	A mongo.code.w.scope object
`mongo.bson.int`	An integer
`mongo.bson.timestamp`	A mongo.timestamp object
`mongo.bson.long`	A double

Special handling:

mongo.bson.object: If the object is recognized as a complex value (of the form "r" : double, "i" : double ), a complex value is returned. If the special wrapper as output by
mongo.bson.buffer.append.object() is detected, an appropriately attributed R object is returned; otherwise, a list is returned containing the subfields.

mongo.bson.array: If all fields of the array are of the same atomic type, a vector of that type is returned. (Multidimensinal arrays are detected and the dims attribute will be set accordingly. Arrays of complex values are also detected as above). Otherwise, a list is returned containing the subfields.

mongo.bson.binary: If non-zero, the subtype of the binary data is stored in the attribute "subtype". See mongo.bson.buffer.append.raw().

mongo.bson.iterator,
mongo.bson.iterator.create,
mongo.bson.find,
mongo.bson.iterator.next,
mongo.bson.iterator.key,
mongo.bson.iterator.type,
mongo.bson.

buf <- mongo.bson.buffer.create()
# Append a string
mongo.bson.buffer.append(buf, "name", "Joe")
# Append a date/time
mongo.bson.buffer.append(buf, "created", Sys.time())
# Append a NULL
mongo.bson.buffer.append(buf, "cars", NULL)
b <- mongo.bson.from.buffer(buf)

# iterate through all values and print them with their keys (names)
iter <- mongo.bson.iterator.create(b)
while (mongo.bson.iterator.next(iter)) { # eoo at end stops loop
    print(mongo.bson.iterator.key(iter))
    print(mongo.bson.iterator.value(iter))
}