Searching doesn't work with mongoengine

[Muhammet Can]

I'm having troubles with searching functionality. I use flask-superadmin with mongoengine. But I'm not sure if this problem is related to mongoengine as @wojcikstefan stated in #31 (comment)

Here is the trace:

    Traceback (most recent call last):
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/werkzeug/contrib/fixers.py", line 125, in __call__
    return self.app(environ, start_response)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask_superadmin/base.py", line 37, in inner
    return f(self, *args, **kwargs)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask_superadmin/base.py", line 37, in inner
    return f(self, *args, **kwargs)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask_superadmin/base.py", line 37, in inner
    return f(self, *args, **kwargs)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask_superadmin/base.py", line 37, in inner
    return f(self, *args, **kwargs)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask_superadmin/model/base.py", line 311, in list
    search_query=search_query)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/flask_superadmin/model/backends/mongoengine/view.py", line 82, in get_list
    count = qs.count()
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/queryset.py", line 108, in count
    self._len = super(QuerySet, self).count(with_limit_and_skip)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/base.py", line 339, in count
    return self._cursor.count(with_limit_and_skip=with_limit_and_skip)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/base.py", line 1182, in _cursor
    self._cursor_obj = self._collection.find(self._query,
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/base.py", line 1215, in _query
    self._mongo_query = self._query_obj.to_query(self._document)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/visitor.py", line 92, in to_query
    query = query.accept(QueryCompilerVisitor(document))
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/visitor.py", line 139, in accept
    self.children[i] = self.children[i].accept(visitor)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/visitor.py", line 157, in accept
    return visitor.visit_query(self)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/visitor.py", line 80, in visit_query
    return transform.query(self.document, **query.query)
  File "~/python/.ENVS/flask/lib/python2.7/site-packages/mongoengine/queryset/transform.py", line 59, in query
    raise InvalidQueryError(e)
InvalidQueryError: Cannot resolve field "t"

[Muhammet Can]

oh i see search text functionality is still in development branch of mongoengine. ver 0.9.x [1]
the problem is probably related to there.

[1] http://docs.mongoengine.org/changelog.html

[Stefan Wójcik]

Hey @jeffisabelle! The stack trace on its own doesn't explicitly identify the issue. What MongoEngine docs did you register in the admin and how? Is t actually a field on one of the documents you defined?

[Muhammet Can]

Hi again,

here how my model looks like. I try to set indexes as described here;
http://docs.mongoengine.org/en/latest/guide/text-indexes.html

this document says that i should set field with a $ prefix. But it raises an exception if i use $ prefix.
mongoengine.errors.LookUpError: Cannot resolve field "$title"

class Post(Document):
    title = StringField()
    slug = StringField()
    publish_date = DateTimeField()
    score = FloatField()
    upvote = IntField()
    downvote = IntField()
    thumbnail = StringField()
    comment_count = IntField(default=0)
    dortgen = ReferenceField(Dortgen)
    sender = ReferenceField(User)
    seq = SequenceField()
    replies = ListField(EmbeddedDocumentField(Comment))

    meta = {
        'allow_inheritance': True,
        'indexes': [
            {
                'fields': ['title'],
                'default_language': 'english'
            }
        ]
    }

and this is the admin model I use.

class PostModel(model.ModelAdmin):
    fields = (
        "title", "slug", "publish_date",
        "score", "upvote", "downvote", "dortgen",
        "url", "domain", "comment_count", "thumbnail"
    )

    list_display = ("title", "dortgen", "publish_date")
    search_fields = ("title")

I'm not sure but, i think its related with my version of mongoengine. The above article states that
I can search objects with QuerySet.search_text method.

However when i look at my query set objects, they don't seem to have a search_text method.

[Stefan Wójcik]

Change this line:
search_fields = ("title")
to this one:
search_fields = ("title",)

That comma at the end is necessary to make it a tuple. ("title") is just a string and since search_fields is supposed to be an iterable, it treats the value as a list of chars, i.e. search_fields = ("t", "i", "t", "l", "e"). Hence the error: InvalidQueryError: Cannot resolve field "t"

[Muhammet Can]

Oh, that's did the trick. thanks @wojcikstefan!

[Stefan Wójcik]

No problem, you can close this issue now :)