def install(self, id, units, options={}):
"""
Install content on a consumer.
@param id: A consumer id.
@type id: str
@param units: A list of content units to be installed.
@type units: list of:
{ type_id:<str>, unit_key:<dict> }
@param options: Install options; based on unit type.
@type options: dict
"""
collection = Consumer.get_collection()
consumer = collection.find_one({'id': id})
if consumer is None:
raise MissingResource(id)
agent = PulpAgent(consumer)
agent.install_units(units, options)
