IDocumentSession.Query<> returns null when searching for a single document about marten

[mysticmind]

Query for a single document should work fine. What is the value of slug which you are searching and the entry in db? It would help for you to provide some code with data for us to check.

[johnholliday]

This is the method:

    public async Task<Template?> GetBySlugAsync(string slug)
    {
        var templates = await _session.Query<Template>().ToListAsync();
        if (templates != null) foreach (var item in templates) if (item.Slug == slug) return item;
        // return await _session.Query<Template>().Where(x => x.Slug == slug).SingleOrDefaultAsync();
        return default;
    }

This is value of "slug" that is being passed to the method:

var slug = "my-document-template";

This is the entry in the database:

{
  "id": "57b5239b-171d-4200-9bd2-ed7951d76e72",
  "title": "My Document Template",
  "slug": "my-document-template",
  "description": "a brief Document description",
  "tags": [
    "first tag",
    "another tag"
  ]
}

Retrieving the entire list and then matching on the slug returns the correct database entry.
Querying for a single document returns null.

[jeremydmiller]

@johnholliday Hey, check your JSON settings in Marten. Notice that "slug" is I'm guessing camel casing in your database. Are you explicitly setting your JSON casing to CamelCase with Marten?

I'm moving this to a discussion, because it's extremely unlikely that this is anything but the JSON serialization settings.