Skip to main content

GraphQL–DotNet–Nullability

In GraphQL all types are nullable by default. In the first version of GraphQL non-null fields were even not supported at all(!).

There is a good reason for this; evolvability of your API. Non-nullable fields make it hard to change your contract. Switching from a non-nullable to a nullable field will always be a breaking change. This explains why GraphQL makes every type nullable by default, and you have to explicitly mark a field as non-null by adding the bang character (!) to your schema definition.

When you are using GraphQL.NET, the principles above still apply but the library follows some different rules to mark a field as nullable or not. For structs (integers, booleans, …) GraphQL.NET will mark them as not-null by default. You even have to explicitly mark them as nullable(see this post: https://bartwullems.blogspot.com/2018/11/graphqldotnetnullable-types-nullable.html). For all other types the rules above are followed and every type is nullable by default.

If you don’t want this, you have to wrap your GraphQL.NET type in a NonNullGraphType wrapper.

Here is a example for a single type:

This will generate the following schema:

And also an example for a list:

This will generate the following schema:

More information:

Labels:

Popular posts from this blog

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...
Read more

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Col...
Read more