$top option doesn't work

[williamhCode]

Hello, I'm a Purdue student using the api for my CS 307 software engineering project. I'm trying to implement a searching function for all courses, but I noticed that purdue api doesn't support the $top query option. The problem is if there's too many results it takes a while to load, which stalls the searching. It would be a lot more efficient to use $top and $skip so I can lazy load the results when scrolling down. Is it trivial to implement $top? If you don't have time and it's relatively simple I was thinking I could make a pull request.

Result of this query Courses?$top=10:

{
    "error": {
        "code": "",
        "message": "The query specified in the URI is not valid. The limit of '0' for Top query has been exceeded. The value from the incoming request is '10'.",
        "details": [],
        "innererror": {
            "message": "The limit of '0' for Top query has been exceeded. The value from the incoming request is '10'.",
            "type": "Microsoft.OData.ODataException",
            "stacktrace": "   at Microsoft.AspNetCore.OData.Query.Validator.TopQueryValidator.Validate(TopQueryOption topQueryOption, ODataValidationSettings validationSettings)\n   at Microsoft.AspNetCore.OData.Query.Validator.ODataQueryValidator.Validate(ODataQueryOptions options, ODataValidationSettings validationSettings)\n   at Microsoft.AspNetCore.OData.Query.EnableQueryAttribute.ValidateQuery(HttpRequest request, ODataQueryOptions queryOptions)\n   at Microsoft.AspNetCore.OData.Query.EnableQueryAttribute.OnActionExecuting(ActionExecutingContext actionExecutingContext)"
        }
    }
}

[haydenmc]

Hello! Thank you for the report! I'll take a look when I get a chance, but pull requests are always welcome. 😊

[haydenmc]

I recently had to revert the change that resolved this issue due to a performance regression. Apologies! See #67 for more details.