field label not supported: NAME - postgresql

Question

I use https://github.com/zalando/postgres-operator to deploy PostgreSQL instances and have the following running instances:
kubectl get postgresqls.acid.zalan.do
NAME TEAM VERSION PODS VOLUME CPU-REQUEST MEMORY-REQUEST AGE STATUS
acid-minimal-cluster acid 12 2 1Gi 2d18h SyncFailed
acid-userdb acid 12 2 5Gi 100m 100Mi 2d18h SyncFailed
databaker-userdb databaker 12 2 2Gi 100m 100Mi 2d18h SyncFailed
databaker-users-db databaker 12 2 2Gi 100m 100Mi 2d17h SyncFailed
I try to get the instance as follows:
kubectl get postgresql --field-selector NAME=databaker-userdb
Error from server (BadRequest): Unable to find "acid.zalan.do/v1, Resource=postgresqls" that match label selector "", field selector "NAME=databaker-userdb": field label not supported: NAME
as you can see, I've got error message.
What am I doing wrong?
Update
The yaml file
apiVersion: acid.zalan.do/v1
kind: postgresql
metadata:
annotations:
meta.helm.sh/release-name: user-db
meta.helm.sh/release-namespace: default
creationTimestamp: "2020-06-16T15:58:28Z"
generation: 1
labels:
app.kubernetes.io/managed-by: Helm
team: databaker
managedFields:
- apiVersion: acid.zalan.do/v1
fieldsType: FieldsV1
fieldsV1:
f:metadata:
f:annotations:
.: {}
f:meta.helm.sh/release-name: {}
f:meta.helm.sh/release-namespace: {}
f:labels:
.: {}
f:app.kubernetes.io/managed-by: {}
f:team: {}
f:spec:
.: {}
f:databases:
.: {}
f:users: {}
f:numberOfInstances: {}
f:postgresql:
.: {}
f:version: {}
f:resources:
.: {}
f:limits:
.: {}
f:cpu: {}
f:memory: {}
f:requests:
.: {}
f:cpu: {}
f:memory: {}
f:teamId: {}
f:users:
.: {}
f:databaker: {}
f:volume:
.: {}
f:size: {}
manager: Go-http-client
operation: Update
time: "2020-06-16T15:58:28Z"
- apiVersion: acid.zalan.do/v1
fieldsType: FieldsV1
fieldsV1:
f:status:
.: {}
f:PostgresClusterStatus: {}
manager: postgres-operator
operation: Update
time: "2020-06-16T15:58:53Z"
name: databaker-users-db
namespace: default
resourceVersion: "68486"
selfLink: /apis/acid.zalan.do/v1/namespaces/default/postgresqls/databaker-users-db
uid: 8bc3b591-4346-4cca-a1ae-682a1ad16615
spec:
databases:
users: databaker
numberOfInstances: 2
postgresql:
version: "12"
resources:
limits:
cpu: 500m
memory: 500Mi
requests:
cpu: 100m
memory: 100Mi
teamId: databaker
users:
databaker:
- superuser
- createdb
volume:
size: 2Gi
status:
PostgresClusterStatus: Running

Answer 1

From the documentation
Field selectors let you select Kubernetes resources based on the value of one or more resource fields. Here are some examples of field selector queries:
metadata.name=my-service
metadata.namespace!=default
status.phase=Pending
NAME is not resource field, You can use like following
$ kubectl get postgresql --field-selector metadata.name=databaker-userdb
According to documentation
Supported field selectors vary by Kubernetes resource type. All resource types support the metadata.name and metadata.namespace fields. Using unsupported field selectors produces an error.
To get according to status, you can run
$ kubectl get postgresql | grep "SyncFailed"