Skip to content

Instantly share code, notes, and snippets.

@glen-84

glen-84/hc-custom-filter.cs

Created May 15, 2023 14:32
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save glen-84/3fe64dc0e785517f859b525af61218c2 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save glen-84/3fe64dc0e785517f859b525af61218c2 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. glen-84 created this gist May 15, 2023.
    65 changes: 65 additions & 0 deletions hc-custom-filter.cs
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,65 @@
    public class EntityIdOperationFilterInputType : FilterInputType
    {
    protected override void Configure(IFilterInputTypeDescriptor descriptor)
    {
    descriptor
    .Operation(DefaultFilterOperations.Equals)
    .Type<LongType>();
    }
    }

    public abstract class QueryableEntityIdOperationHandler : QueryableOperationHandlerBase
    {
    protected QueryableEntityIdOperationHandler(InputParser inputParser) : base(inputParser) { }

    protected abstract int Operation { get; }

    public override bool CanHandle(
    ITypeCompletionContext context,
    IFilterInputTypeDefinition typeDefinition,
    IFilterFieldDefinition fieldDefinition)
    {
    return context.Type is EntityIdOperationFilterInputType &&
    fieldDefinition is FilterOperationFieldDefinition operationField &&
    operationField.Id == this.Operation;
    }
    }

    public class QueryableEntityIdEqualsHandler : QueryableEntityIdOperationHandler
    {
    public QueryableEntityIdEqualsHandler(InputParser inputParser) : base(inputParser) { }

    protected override int Operation => DefaultFilterOperations.Equals;

    public override Expression HandleOperation(
    QueryableFilterContext context,
    IFilterOperationField field,
    IValueNode value,
    object? parsedValue)
    {
    Console.WriteLine("Not getting here yet, so not implemented.");

    var property = context.GetInstance();
    return FilterExpressionBuilder.Equals(property, parsedValue);
    }
    }

    // Usage.

    public class ArticleFilterType : FilterInputType<Article>
    {
    protected override void Configure(IFilterInputTypeDescriptor<Article> descriptor)
    {
    descriptor.BindFieldsExplicitly();

    descriptor.Field("entityId").Type<EntityIdOperationFilterInputType>();
    }
    }

    // Registration.

    .AddConvention<IFilterConvention>(
    new FilterConventionExtension(
    x => x.AddProviderExtension(
    new QueryableFilterProviderExtension(
    y => y.AddFieldHandler<QueryableEntityIdEqualsHandler>()))