how to Join with get_query

Just trying to filter on a field from a foreign table.

This doesn’t seem to work

def resolve_articles(self, args, context, info):
        query = Article.get_query(context)
        authorName = args.get('authorName')
        return query.join(Author).filter(Author.name == authorName)

[earlgreyz]

Hey sorry for delay, but it’s been a while since I used sqlalchemy so needed a quick refresh. You don’t need to subclass a connection field instead use a standard one with a custom resolver.

class Author(SQLAlchemyObjectType):
    class Meta:
        model = models.Author
        interfaces = [relay.Node]


class Article(SQLAlchemyObjectType):
    class Meta:
        model = models.Article
        interfaces = [relay.Node]


class Query(graphene.ObjectType):
    all_articles = SQLAlchemyConnectionField(Article, author_name=graphene.String())

    def resolve_all_articles(self, info, author_name):
        query = Article.get_query(info)
        return query.join(models.Author).filter(models.Author.name == author_name).all()

You can file complete files I’ve used to test here: https://gist.github.com/earlgreyz/bcbb9dc1b1e0618fe96125cd57b563a0

[earlgreyz]

@zhanibekshynarbek the problem is that when using add_columns you get a tuple with ArticleModel object and an author_name string. I came up with a rather dirty solution but you may be able to make something nice out of this:

class Article(SQLAlchemyObjectType):
    author_name = graphene.String()

    class Meta:
        model = models.Article
        interfaces = [relay.Node]


class Query(graphene.ObjectType):
    all_articles = SQLAlchemyConnectionField(Article)

    def resolve_all_articles(self, info):
        query = Article.get_query(info)
        query = query.join(models.Author).add_columns(
            models.Author.name.label('author_name'))

        def author_name_modifier(article, author_name):
            article.author_name = author_name
            return article

        return [author_name_modifier(a, n) for (a, n) in query.all()]