How does one access and bind the entity meta-data (through JavaScript on the client) available from Upshot?

Question

One of the supposed benefits of Upshot is its ability to query meta-data exposed through Data Annotations. How would one access meta-data for entity properties for things like string length, default values, display name, description information, and whether a field is required?

How would connect this data into a validation framwork like jQuery Validation or Knockout Validation?

Note: I am currently using Knockout 2.1.0, Upshot 1.0.0.2, Entity Framework 4.3, and ASP.NET MVC4.

Anthony, this is probably my biggest question regarding SPA, upshot, knockout. Have you had any success finding information regarding this outside SO? — Beyers, Jul 26 '12 at 21:11

mhu · Accepted Answer · 2012-10-09T14:36:47.903

You can use the upshot function metadata() to access this information, for example:

If you have the following upshot registration:

@(Html.UpshotContext(bufferChanges: true)
    .DataSource<App.Controllers.DBController>(x => x.GetUsers())
    .ClientMapping<App.Models.User>("User")
)

you can access the metadata (and validation rules) like this:

var metadata = upshot.metadata(upshot.type(User));

you can also retrieve information about properties (eg. "Name"):

var propertyType = upshot.metadata.getPropertyType(upshot.type(User), "Name");

How does one access and bind the entity meta-data (through JavaScript on the client) available from Upshot?

1 Answers1