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Anders Brohus 194 posts 475 karma points

Apr 12, 2019 @ 07:37

Extending Umbraco and using the API

Umbraco 7

Hi Our,

Currently have an strange issue, because i can't extend my "NewsArticle" model, maybe it's me that is doing it wrong..

Because i have an doc type named "News Article", which have inherited the doc type "News Meta", in the "News Meta" i have an heading field which i want to extend but when i regenerate my models it won't stop generating the heading field, which means i get this error,

The type 'NewsArticle' already contains a definition for 'NewsHeading'

The generated field looks like this,

    ///<summary>
    /// Overskrift
    ///</summary>
    [ImplementPropertyType("newsHeading")]
    public string NewsHeading
    {
        get { return ProjectName.Core.Models.NewsMeta.GetNewsHeading(this); }
    }

And the code i have written looks like this,

[ImplementPropertyType("newsHeading")]
    public string NewsHeading
    {
        get
        {
            string newsHeading = NewsMeta.GetNewsHeading(this);
            if (string.IsNullOrWhiteSpace(newsHeading))
            {
                newsHeading = OpenGraphSharing.GetOgTitle(this);

                if (string.IsNullOrWhiteSpace(newsHeading))
                {
                    newsHeading = SEO.GetMetaTitle(this);

                    if (string.IsNullOrWhiteSpace(newsHeading))
                    {
                        newsHeading = this.Name;
                    }
                }
            }
            return newsHeading;                  
        }
    }

The funny part is i have done the same thing with many other thing which works, but they didn't have inherited doc types?

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Dave Woestenborghs 3504 posts 12133 karma points MVP 8x admin c-trib

Apr 12, 2019 @ 07:50

Hi Andres,

Looking at the code I think you are using a composition. Not inheritance? Is that correct.

The news article generated class will probably implement a interface called INewsMeta.

So if you go in the Newsmeta generated file you will see a interface INewsMeta and a class NewsMeta which implements the interface

So what you want to do is create a partial class called NewsMeta

In that you will add a property

 [ImplementPropertyType("newsHeading")]
    public string NewsHeading
    {
        get { return this.GetNewsHeading(this); }
    }

And add a static method called GetNewsHeading

public static string GetNewsHeading(INewsMeta that) {

var newsHeading = that.GetPropertyValue<string>("newsHeading");

if (string.IsNullOrWhiteSpace(newsHeading))
            {
                newsHeading = OpenGraphSharing.GetOgTitle(that);

                if (string.IsNullOrWhiteSpace(newsHeading))
                {
                    newsHeading = SEO.GetMetaTitle(that);

                    if (string.IsNullOrWhiteSpace(newsHeading))
                    {
                        newsHeading = that.Name;
                    }
                }
            }
            return newsHeading;   

 }

After these changes regenerate your models.

Dave

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Anders Brohus 194 posts 475 karma points

Apr 12, 2019 @ 10:55

0

Hi Dave :)

Of course i'm using composition but it's friday ;)

Will try and see if this works, thanks alot! :)

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Anders Brohus 194 posts 475 karma points

Apr 12, 2019 @ 11:38

0

Okay it's not working ..

Now my NewsHeading has been removed from the generated NewsArticle .. :(

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Dave Woestenborghs 3504 posts 12133 karma points MVP 8x admin c-trib

Apr 12, 2019 @ 11:57
0
Is the NewsArticle still implementing the INewsMeta interface ?

What happens if you remove this from your own class
```
 [ImplementPropertyType("newsHeading")]
    public string NewsHeading
    {
        get { return this.GetNewsHeading(this); }
    }
```
And only leave the GetNewsHeading

Dave
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Anders Brohus 194 posts 475 karma points

Jul 05, 2019 @ 09:23

0

Hi Dave :)

I have a question related to this :)

What about if i want to get the node's name in the model when i do the composition in Umbraco 8? :)

Because i can't find the .Name on that? :)

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Dave Woestenborghs 3504 posts 12133 karma points MVP 8x admin c-trib

Apr 12, 2019 @ 12:02

100

I just tested that on a project that is the trick.

In your own partial class you only need to have the GetNewsHeading method.

Than it will work.

Dave

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Anders Brohus 194 posts 475 karma points

Apr 15, 2019 @ 09:35

0

Nice thanks alot, it worked! :)

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