[Fixed]-Django Rest: Correct data isn't sent to serializer with M2M model

by

1👍

✅

To return the correct data format the function “to_internal” can be overridden in the ProjectSerializer, like this:

class ProjectSerializer(serializers.HyperlinkedModelSerializer):
    seqrecords = ProjectMetaSerializer(source='projectmeta_set', many=True)

    class Meta:
        model = Project
        fields = ['id', 'name', 'seqrecords']
        ReadOnlyField = ['id']

    def to_internal_value(self, data):
        ''' Override standard method so validated data have seqrecords '''
        context = super(ProjectSerializer, self).to_internal_value(data)
        context['seqrecords'] = data['seqrecords']

        return context

    def validate(self, data):
        ...

    def create(self, validated_data):
        ...
        return project

This method is of course dependent on good a validation function for the “seqrecords” field in validate().

👤Christian Ravn

0👍

As you see in the ProjectMetaSerializer, the fields id and name are ReadOnlyFields. So you can’t use them in post request.

class ProjectMetaSerializer(serializers.ModelSerializer):
    seqrecords = SeqRecordSerializer(many=True)

    class Meta:
        model = ProjectMeta
        fields = ['seqrecords',]


class ProjectSerializer(serializers.ModelSerializer):
    project_meta = ProjectMetaSerializer(many=True)

    class Meta:
        model = Project
        fields = ['id', 'name', 'project_meta']
        ReadOnlyField = ['id']

def create(self, validated_data):
    project = Project(name=validated_data['name'])
    project.save()
    # This is where it all fails
    for seq in validated_data['seqrecords']:
        sequence = SeqRecord.objects.filter(id=seq['id'])
        meta = ProjectMeta(project=project,
                           sequence=sequence,
                           order=seq['order'])
        meta.save()
    return project

class SeqRecordSerializer(serializers.ModelSerializer):
    class Meta:
        model = SeqRecord
        fields = ['id', 'name', 'sequence']
👤Sagar Ramachandrappa

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