Enabling entity inserts, updates, and deletes

Although the most common use for OData is to provide a Web API that supports custom queries, you might also want to support CRUD operations like inserts. Let’s see how to do that:

1. In ProductsController.cs, add an action method to respond to POST requests, as shown in the following code:

   public IActionResult Post([FromBody] Product product)
   {
     db.Products.Add(product);
     db.SaveChanges();
     return Created(product);
   }
   

2. Set a breakpoint on the open brace of the method.
3. Start the OData web service with debugging.
4. In Visual Studio Code, in the RestClientTests folder, create a new file named odata-catalog-insert-product.http, as shown in the following HTTP request:

   POST https://localhost:5101/catalog/products
   Content-Type: application/json
   Content-Length: 234
   {
     "ProductName": "Impossible Burger",
     "SupplierId": 7,
     "CategoryId": 6,
     &quot...