__init__.py

from .architecture import Architecture  # noqa
from .domain import Domain  # noqa
from .environment import Environment  # noqa
from .host import Host  # noqa
from .operatingsystem import OperatingSystem  # noqa
from .partitiontable import PartitionTable  # noqa
from .smartproxy import SmartProxy  # noqa

gistfile1.pytb

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-f3d7317134fb> in <module>()
----> 1 import robottelo.records.host

/home/asaleh/Robotello/robottelo/robottelo/records/host.py in <module>()
      1 from robottelo.common import records
      2 from robottelo.api.apicrud import ApiCrud
----> 3 from robottelo.records import Environment
      4 from robottelo.records import Architecture
      5 from robottelo.records import Domain

ImportError: cannot import name Environment

host.py

from robottelo.common import records
from robottelo.api.apicrud import ApiCrud
from robottelo.records import Environment
from robottelo.records import Architecture
from robottelo.records import Domain
from robottelo.records import SmartProxy
from robottelo.records import PartitionTable
from robottelo.records import OperatingSystem

class HostApi(ApiCrud):
        api_path = "/api/hosts/"
        api_json_key = u"host"
        create_fields = ["name",
                         "environment_id",
                         "architecture_id",
                         "root_pass",
                         "mac",
                         "domain_id",
                         "puppet_proxy_id",
                         "ptable_id",
                         "operatingsystem_id"]


class Host(records.Record):
    name = records.StringField(format=r"host\d\d\d\d\d")
    root_pass = records.StringField(default = "changeme")
    mac = records.MACField()
    environment = records.RelatedField(Environment)
    architecture = records.RelatedField(Architecture)
    domain = records.RelatedField(Domain)
    puppet_proxy = records.RelatedField(SmartProxy)
    operatingsystem = records.RelatedField(OperatingSystem)
    ptable = records.RelatedField(PartitionTable)

    def _post_init(self):
        self.name = self.name + "." + self.domain.name
        self.architecture.operatingsystem = [self.operatingsystem]
        self.ptable.operatingsystem = [self.operatingsystem]

    class Meta:
        api_class = HostApi