<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def patch_collection(self, collection, changes):
 """ Will make specific updates to a record based on JSON Patch documentation. https://tools.ietf.org/html/rfc6902 the format of changes is something like:: [{ 'op': 'add', 'path': '/newfield', 'value': 'just added' }] """

        uri = str.join('/', [self.uri, collection])
        return self.service._patch(uri, changes)