YFilter dropped when used with NetconfService and EntityCollection

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Expected Behavior

From: https://communities.cisco.com/thread/92597
Below 2 scripts should produce same payloads.

Current Behavior

from ydk.models.cisco_ios_xr import Cisco_IOS_XR_ipv4_ospf_cfg
from ydk.filters import YFilter  
from ydk.services import NetconfService                       
from ydk.services import Datastore
from ydk.providers import NetconfServiceProvider    

os=Cisco_IOS_XR_ipv4_ospf_cfg.Ospf()
os.yfilter = YFilter.create
                                
n = NetconfService()
provider = NetconfServiceProvider(address='<ip-addr>' , username='<>', password='<>')

With the above object, below 2 scripts are producing different payloads

Your Script

n.edit_config(provider,Datastore.running,[os])

produces below xml

  <edit-config>
    <target>
      <running/>
    </target>
    <config>
      <ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-cfg"/>
    </config>
  </edit-config>
</rpc>

n.edit_config(provider,Datastore.running,os)

produces below xml

  <edit-config>
    <target>
      <running/>
    </target>
    <config>
      <ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-cfg" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" nc:operation="create"/>
    </config>
  </edit-config>

System Information

ydk 0.7.2-dev

[ygorelik]

Fixed the issue in YDK-0.8.1.

Test Script

from __future__ import absolute_import

import sys
import unittest
import logging

from ydk.filters import YFilter  
from ydk.providers import NetconfServiceProvider
from ydk.services import NetconfService, Datastore

from test_utils import print_entity

from ydk.models.cisco_ios_xr import Cisco_IOS_XR_ipv4_ospf_cfg

def enable_logging(level):
    log = logging.getLogger('ydk')
    log.setLevel(level)
    handler = logging.StreamHandler()
    formatter = logging.Formatter(("%(asctime)s - %(name)s - %(levelname)s - %(message)s"))
    handler.setFormatter(formatter)
    log.addHandler(handler)

if __name__ == '__main__':
    enable_logging(logging.INFO)
    ncc = NetconfServiceProvider(address='10.30.110.84', username='admin', password='admin', port=830)
    root_schema = ncc.get_session().get_root_schema()
    ns = NetconfService()

    os=Cisco_IOS_XR_ipv4_ospf_cfg.Ospf()
    os.yfilter = YFilter.create

    ns.edit_config(ncc, Datastore.candidate, [os])

    ns.discard_changes(ncc)

Resulting Log

2019-01-11 09:59:04,853 - ydk - INFO - Path where models are to be downloaded: /home/yan/.ydk/10.30.110.84_830
2019-01-11 09:59:04,871 - ydk - INFO - Connected to 10.30.110.84 on port 830 using ssh with timeout of -1
2019-01-11 09:59:04,872 - ydk - INFO - Executing 'edit-config' RPC on [Cisco-IOS-XR-ipv4-ospf-cfg:ospf]
2019-01-11 09:59:04,904 - ydk - INFO - ============= Generated RPC to send to device =============
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><edit-config xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
  <target>
    <candidate/>
  </target>
  <config><ospf xmlns="http://cisco.com/ns/yang/Cisco-IOS-XR-ipv4-ospf-cfg" xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0" nc:operation="create"/>
</config>
</edit-config>
</rpc>

2019-01-11 09:59:05,218 - ydk - INFO - ============= Reply RPC received from device =============
<?xml version="1.0"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="1">
  <ok/>
</rpc-reply>

2019-01-11 09:59:05,219 - ydk - INFO - Executing 'discard-changes' RPC
2019-01-11 09:59:05,220 - ydk - INFO - ============= Generated RPC to send to device =============
<rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"><discard-changes xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"/>
</rpc>

2019-01-11 09:59:05,544 - ydk - INFO - ============= Reply RPC received from device =============
<?xml version="1.0"?>
<rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="2">
  <ok/>
</rpc-reply>

2019-01-11 09:59:05,544 - ydk - INFO - Disconnected from device

Note. The filter nc:operation="create" is present in the RPC as expected.