django serializer with nested column - django

Question

I'm calling the following serializer -
class ResourceSerializer(serializers.ModelSerializer):
class Meta:
model = Resmst
resource_name = 'resmst'
fields = ('resmst_id', 'resmst_name', 'resmst_desc', 'resmst_limit', 'resmst_inuse', 'resmst_active', 'resmst_lstchgtm',
'resmst_prntid', 'resmst_owner', 'resmst_public', 'resmst_locked', 'resmst_offline')
read_only_fields = ('resmst_id',)
resmst_owner is a FK relation to another table. What I want to do is have the serializer display the information from a column where that FK relates.
This is the current json -
[
{
"resmst_id": 204,
"resmst_name": "GAWK",
"resmst_desc": null,
"resmst_limit": 1,
"resmst_inuse": 0,
"resmst_active": "Y",
"resmst_lstchgtm": "2014-08-20T11:15:18",
"resmst_prntid": null,
"resmst_owner": 822,
"resmst_public": "Y",
"resmst_locked": null,
"resmst_offline": 0
}
]
And this is how I want it to look -
[
{
"resmst_id": 204,
"resmst_name": "GAWK",
"resmst_desc": null,
"resmst_limit": 1,
"resmst_inuse": 0,
"resmst_active": "Y",
"resmst_lstchgtm": "2014-08-20T11:15:18",
"resmst_prntid": null,
"owner_name": "John Smith",
"resmst_public": "Y",
"resmst_locked": null,
"resmst_offline": 0
}
]
Or am I stuck with having to do it this way -
[
{
"resmst_id": 204,
"resmst_name": "GAWK",
"resmst_desc": null,
"resmst_limit": 1,
"resmst_inuse": 0,
"resmst_active": "Y",
"resmst_lstchgtm": "2014-08-20T11:15:18",
"resmst_prntid": null,
"resmst_owner": {
"owner_name": "John Smith"
},
"resmst_public": "Y",
"resmst_locked": null,
"resmst_offline": 0
}
]

Answer 1

Haven't tested this but it looks like this question. Try to use a SerializerMethodField.

Answer 2

I think you should be fine with a regular Field (note that this is readonly).
class ResourceSerializer(serializers.ModelSerializer):
owner_name = serializers.Field(source='resmst_owner.owner_name')
class Meta:
model = Resmst
resource_name = 'resmst'
fields = ('resmst_id', 'resmst_name', 'resmst_desc', 'resmst_limit',
'resmst_inuse', 'resmst_active', 'resmst_lstchgtm',
'resmst_prntid', 'resmst_owner', 'resmst_public',
'resmst_locked', 'resmst_offline', 'owner_name', )
read_only_fields = ('resmst_id',)
Don't forget to add it to Meta.fields (as above).
See the section on Core arguments:
source
The name of the attribute that will be used to populate the
field. May be a method that only takes a self argument, such as
Field(source='get_absolute_url'), or may use dotted notation to
traverse attributes, such as Field(source='user.email').
The value source='*' has a special meaning, and is used to indicate
that the entire object should be passed through to the field. This can
be useful for creating nested representations. (See the implementation
of the PaginationSerializer class for an example.)
Defaults to the name of the field.