Contains FilterExpressionBuild to compare using StringComparison

Product

Hot Chocolate

Is your feature request related to a problem?

Yes, filtering strings with StringComparison (to ignore case sensitivity for example) isn't currently possible.

The solution you'd like

In HotChocolate.Data.Filters.Expressions.FilterExpressionBuilder, Add:

private static readonly MethodInfo _containsWithStringComparison = ReflectionUtils.ExtractMethod<string>(x => x.Contains(default(string)!, default));

Add overload to the Contains method with the signature or where a contains method for strings makes more sense.

public static Expression Contains(Expression property, object value, StringComparison stringComparison)
{
 return Expression.AndAlso(Expression.NotEqual(property, _null),
                              Expression.Call(property,
                                              _containsWithStringComparison,
                                              CreateParameter(value, property.Type),
                                              Expression.Constant(stringComparison, typeof(StringComparison))));
}

Possibly make the QueryableString*Handlers have the option to use StringComparison.

Start in HotChocolate.Data.Filters.Expressions.FilterExpressionBuilder and inspect the existing Contains implementation and its reflection helpers. Add support for the StringComparison overload described in the issue, then review the QueryableString*Handlers to determine whether they should expose the option. Done means string filtering can compare with a specified StringComparison without breaking existing behavior.