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  • Ismail Mayat 4511 posts 10092 karma points MVP 2x admin c-trib
    Jul 10, 2020 @ 08:57
    Ismail Mayat
    0

    Modify graphql property before render

    I have site v7 that is using umbraco graphql package. I have doctype alert which I can get using query like:

    { content {
byUrl(url: "/alerts/test/") {
  ... on Alert {
    _contentData {
      name
    },title
    summary
  }
}}}

    What i want to do is before render for the summary field which is rich text edit field modify img tag. I have service to do this however I am unsure how to tap in the rendering process of graphql to intercept. I have for now got project using actual source code of umbraco graphql project.

    Would I need to modify StringValueResolver and create my own StringGraphType that does the transformation? 

            public override Type GetGraphQLType(PublishedPropertyType propertyType)
    {

        if (propertyType.PropertyTypeAlias == "summary")
        {
            return typeof(CustomStringGraphType);
        }

        return propertyType.ClrType == typeof(string) 
            ? typeof(StringGraphType)
            : typeof(ListGraphType<StringGraphType>);
    }

    And in my CustomStringGraphType override 

        public override object Serialize(object value)
{
  return value;
}

    and do my transformation there?

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  • Ismail Mayat 4511 posts 10092 karma points MVP 2x admin c-trib
    Jul 10, 2020 @ 15:12
    Ismail Mayat
    100

    OK so managed to get this sorted. I modified ComplexGraphTypeOfIPublishedContentExtensions.cs and around line 113 added the following:

     if (AlertWithImage(context, publishedProperty))
                    {
                        HtmlString tmp = (HtmlString) propertyValue;
                        var transformed = encoder.Convert(tmp.ToHtmlString());
                        HtmlString html = new HtmlString(transformed);
                        propertyValue = html;
                    }

    That did it

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