[ENG-9043] get default_license_id on preprint creation to handle it on FE (looks like it is not used drafts/id/metadata) for prepints in browser url so for get request is is redundant (CenterForOpenScience#11464)

get default_license_id on draft registration creation (to get for FE after creation) and also for GET/ request to get it on drafts/id/metadata request

Author: mkovalua

api/draft_registrations/serializers.py

@@ -98,6 +98,7 @@ class DraftRegistrationSerializer(DraftRegistrationLegacySerializer, Taxonomizab
     )
 
     has_project = ser.SerializerMethodField()
+    default_license_id = ser.CharField(source='provider.default_license._id', read_only=True, default='')
 
     def get_has_project(self, obj):
         return obj.has_project
@@ -164,6 +165,8 @@ class DraftRegistrationDetailSerializer(DraftRegistrationSerializer, DraftRegist
         'self': 'get_self_url',
     })
 
+    default_license_id = ser.CharField(source='provider.default_license._id', read_only=True, default='')
+
     def get_self_url(self, obj):
         return absolute_reverse(
             'draft_registrations:draft-registration-detail',

api/preprints/serializers.py

@@ -256,6 +256,7 @@ class PreprintSerializer(TaxonomizableSerializerMixin, MetricsSerializerMixin, J
     why_no_prereg = ser.CharField(required=False, allow_blank=True, allow_null=True)
     prereg_links = ser.ListField(child=ser.URLField(), required=False)
     prereg_link_info = ser.ChoiceField(Preprint.PREREG_LINK_INFO_CHOICES, required=False, allow_blank=True)
+    default_license_id = ser.CharField(source='provider.default_license._id', read_only=True, default='')
 
     class Meta:
         type_ = 'preprints'