TypeScript Partial type without undefined

TS 4.4 UPDATE: TS4.4 will have an –exactOptionalPropertyTypes compiler flag to give you the behavior you’re looking for directly with Partial, as long as you intentionally add undefined where you’d like to allow it: interface MyType { foo: string bar?: number | undefined // <– you want this } const merge = (value1: MyType, value2: … Read more

How to implement TypeScript deep partial mapped type not breaking array properties

With TS 2.8 and conditional types we can simply write: type DeepPartial<T> = { [P in keyof T]?: T[P] extends Array<infer U> ? Array<DeepPartial<U>> : T[P] extends ReadonlyArray<infer U> ? ReadonlyArray<DeepPartial<U>> : DeepPartial<T[P]> }; or with [] instead of Array<> that would be: type DeepPartial<T> = { [P in keyof T]?: T[P] extends (infer U)[] … Read more

Modifying MVC 3 ViewBag in a partial view does not persist to the _Layout.cshtml

If you pass the ViewBag into the partial’s viewdatadictionary, then pull it out (and cast), you can do whatever you want and the reference is kept. The cool part is that since it’s dynamic, you can even add properties and then they’ll show up on the parent page’s Viewbag. Page: //set the viewbag into the … Read more

How can I render Partial views in asp.net mvc 3?

Create your partial view something like: @model YourModelType <div> <!– HTML to render your object –> </div> Then in your view use: @Html.Partial(“YourPartialViewName”, Model) If you do not want a strongly typed partial view remove the @model YourModelType from the top of the partial view and it will default to a dynamic type. Update The … Read more

How to extend DbContext with partial class and partial OnModelCreating method in EntityFramework Core

EFCore 3 – They FINALLY fixed this! You can now implement OnModelCreatingPartial in a partial class like this. Note the partial keyword on both the class and method: public partial class RRStoreContext : DbContext { partial void OnModelCreatingPartial(ModelBuilder builder) { builder.Entity<RepeatOrderSummaryView>().HasNoKey(); } } If you look at the generated context file – right at the … Read more

python equivalent of functools ‘partial’ for a class / constructor

I don’t think there’s a standard method to do it, but if you need it often, you can just put together your own small function: import functools import collections def partialclass(cls, *args, **kwds): class NewCls(cls): __init__ = functools.partialmethod(cls.__init__, *args, **kwds) return NewCls if __name__ == ‘__main__’: Config = partialclass(collections.defaultdict, list) assert isinstance(Config(), Config)