Use project detail endpoint with admin serializer

Add the `environment_variables` field to this serializer that will be
returned only when the user is admin.

Author: humitos

readthedocs/projects/tasks.py

@@ -663,9 +663,7 @@ def get_env_vars(self):
             })
 
         # Update environment from Project's specific environment variables
-        env.update(
-            api_v2.project(self.project.pk).environment_variables().get(),
-        )
+        env.update(self.project.environment_variables)
 
         return env
 

readthedocs/restapi/serializers.py

@@ -43,6 +43,12 @@ class ProjectAdminSerializer(ProjectSerializer):
         slug_field='feature_id',
     )
 
+    def get_environment_variables(self, obj):
+        return {
+            variable.name: variable.value
+            for variable in obj.environmentvariable_set.all()
+        }
+
     class Meta(ProjectSerializer.Meta):
         fields = ProjectSerializer.Meta.fields + (
             'enable_epub_build',