gkama.graph.ql

sample project for GraphQL for .NET Core. it uses the following technologies:

• ASP.NET Core 3.1 API
• GraphQL with ui/playground
• Entity Framework Core for creating a in-memory database with sample datasets
• Defined query and schema for countries with neighbouring countries
• Docker image

the initial scaffolding is in Start.cs and then the rest is done through objects inheriting from GraphQL's classes. it defines a base class of Country.cs, CountryNeighbour.cs, CountryPostalCode and the corresponding ...Type classes that inherit ObjectGraphType<T>. then the schema and query is defined, which are used by the ui/playground endpoint for the client side to work it and create queries

a docker image is also available (https://hub.docker.com/r/gkama/dotnet) via docker pull gkama/dotnet:graphql

example

a sample request would go like this

{
  countries {
    name
    neighbours {
      name
    }
    postalcodes {
        num_postal_codes
    }
  }
}

and the response

{
  "data": {
    "countries": [
      {
        "name": "Spain",
        "neighbours": [
          {
            "name": "Portugal"
          },
          {
            "name": "France"
          }
        ],
        "postalcodes": {
          "num_postal_codes": 37867
        }
      },
      {
        "name": "United States",
        "neighbours": [
          {
            "name": "Canada"
          },
          {
            "name": "Mexico"
          }
        ],
        "postalcodes": {
          "num_postal_codes": 41468
        }
      }
    ]
  }
}

resources

a little bit more about GraphQL for the ones unfamiliar - "it is an open-source data query and manipulation language for APIs, and a runtime for fulfilling queries with existing data. GraphQL was developed internally by Facebook in 2012 before being publicly released in 2015"

open sourced GraphQL project

• https://github.com/graphql/graphql-spec

open sourced GraphQL for .NET

• https://github.com/graphql-dotnet/graphql-dotnet
• https://github.com/graphql-dotnet/graphql-dotnet/blob/master/docs/src/getting-started.md
• https://github.com/graphql-dotnet/examples