Filtering

Note: Be sure to install the HotChocolate.Types.Filters NuGet package.

Next we will add filtering to the users query, so we can filter on fields provided in the entity.

This is simply done by adding .UseFiltering() on the field we want to filter, like seen on below.

./GraphQL/QueryType.cs

using HotChocolate.Types;

namespace SlackClone.GraphQL
{
    public class QueryType : ObjectType<Query>
    {
        protected override void Configure(IObjectTypeDescriptor<Query> descriptor)
        {
            descriptor.Field(t => t.GetUsers()).UseFiltering();
            descriptor.Field(t => t.GetUserStatuses());
        }
    }
}

Now we can run the server again and test what we have added. Reading the schema documentation you can see the filtering capabilities added to users query.

Lets test the filtering with the following query in the playground.

{
  users(where: { firstName_starts_with: "D" }) {
    id
    firstName
    lastName
    fullName
    email
    username
  }
}

If everything went well you should see the following response.

{
  "data": {
    "users": [
      {
        "id": "1964199a-e8be-440a-a178-8998d114fd12",
        "firstName": "Donald",
        "lastName": "Trump",
        "fullName": "Donald Trump",
        "email": "[e-mail]",
        "username": "dtrump"
      }
    ]
  }
}