Hi,
I am quite new to Phoenix and Elixir, but I love it already.
I just want to make sure the behavior I have observed is correct.
I use Phoenix 1.4.

I want to create a REST server.

1. I created an app and installed all dependencies:

mix phx.new my-app --app my_app --no-html --no-webpack

2. Created the DB:

cd my-app
mix ecto.create

3. Generated a Product Schema

mix phx.gen.context Operations Product products product_name:string in_in_stock:boolean quantity:integer

4. Then, migration:

mix ecto.migrate

5. I generate a JSON CRUD with --no-context and --no-schema, since we already have them available:

mix phx.gen.json Operations Product products product_name:string in_in_stock:boolean quantity:integer --no-context --no-schema

6. I add recommended resource endpoints to the router in the /api scope:

resources "/products", ProductController

7. Then, I start the server in the dev mode with the local DB:

mix phx.server

8. Finally, I can create the creation endpoint (by default all parameters are required):
   a) all parameters supplied - SUCCESS!

curl -H "Content-Type: application/json" -X POST -d '{"product":{"product_name":"Product1","in_in_stock":true, "quantity": 1}}' http://localhost:4000/api/products

b) missing one required parameter - FAILURE! (Correct behavior!)

curl -H "Content-Type: application/json" -X POST -d '{"product":{"product_name":"Product1","in_in_stock":true, "quantity1": 1}}' http://localhost:4000/api/products

9. Here is when I am a little puzzled: PUT. I send a PUT request where none of the parameters in the body are correct and I get status 200OK, but the product does not change at all.

curl -H "Content-Type: application/json" -X PUT -d '{"product":{"product_name1":"Product1","in_in_stock1":true, "quantity1": 1}}' http://localhost:4000/api/products/1

Shouldn’t that return an error?
I tried changing Repo.update() to Repo.update!() in my_app/operations/operations.ex but it fails even with the correct data now.
How can I make sure that atleast one parameter (if not all that are supplied) are correct? How could I enforce all required parameters being passed in the PUT request?
What is the best practise?

Regards
Wojciech