how to access composite values on different doctypes getting an unable to cast error - Using Umbraco And Getting Started

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 11:38
1

How to access composite values on different doctypes? Getting an "Unable to cast" error

Using Umbraco And Getting Started

Umbraco 7
So I have a Document Type which has a lot of child pages. These child pages offer different layouts, so I made a doctype for each of them. Now I've created a bunch of content with these different doctypes, but there's a problem: I want to access the properties of the child elements' composition doctype, which has properties shared on all of them.

Imagine this: You have a products page, which has a lot of products in them. You need to have two doctypes: Products and Product. I have 3x Product with some different properties, but I also have a Product overview (alias is ProductOverview) doctype, which contains the propeties for each Product, but which is only shown on the Products page.

I am trying to do this, but I cannot cast it and it doesn't work like that:

Products.cshtml
```
@foreach(ProductOverview product in Model.Content.Children) {
    <img src="product.OverviewImage.First().Url" />
}
```
But I cannot cast ProductOverview to Product1 (doctype alias is Product1).

If I do something like change the @foreach(ProductOverview product in Model.Content.Children) to @foreach(Product1 product in Model.Content.Children) then it also gives me a cast error. I know all the children have these propeties, so I don't need to check that.

Thanks
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Michaël Vanbrabandt 863 posts 3348 karma points c-trib

Oct 26, 2017 @ 12:09

0

Hi Morten,

How did you set up the node structure and the permissions for all these document types, can you show us this?

/Michaël

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:13
0
Pretty simple:

Content
```
Products
    Product 1 (Product 1 doctype)
    Product 2 (Product 1 doctype)
    Product 3 (Product 2 doctype)
    Product .......
```
Document Types
```
Products (folder)
    Products
    Product 1
    Product 2
    ProductOverview
```
Product 1 and Product 2 are the two different doctypes (with different templates), but they both have ProductOverview as a composition.
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Michaël Vanbrabandt 863 posts 3348 karma points c-trib

Oct 26, 2017 @ 12:21
0
Ok now its clear.

Can you try to access the OverviewImage property by using GetPropertyValue("alias") ?
```
@foreach(var product in Model.Content.Children) {
    <img src="product.GetPropertyValue("overviewImage").First().Url" />
}
```
/Michaël
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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:23

0

'object' does not contain a definition for 'First' and no extension method 'First' accepting a first argument of type 'object' could be found

That's what I'm getting.

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:23

0

'object' does not contain a definition for 'First' and no extension method 'First' accepting a first argument of type 'object' could be found

That's what I'm getting.

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Michaël Vanbrabandt 863 posts 3348 karma points c-trib

Oct 26, 2017 @ 12:25

0

What kind of property is overviewImage ?

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:25

0

Media Picker

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Michaël Vanbrabandt 863 posts 3348 karma points c-trib

Oct 26, 2017 @ 12:31

Can you do the following:

@foreach(var product in Model.Content.Children) {

    // Get the id's of the selected images from your media picker
    var overviewList = product.GetPropertyValue<string>("overviewImage").Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse);

    // Get the Umbraco media file
    var overviewImage = Umbraco.TypedMedia(overviewList.First());

    <img src="overviewImage.Url" />

}

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:38

0

System.FormatException: 'Input string was not in a correct format.'

I guess this is a workaround, but is this really the best way to do it? I'm using dynamic models, so I should be able to, somehow, grab the value normally.

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Michaël Vanbrabandt 863 posts 3348 karma points c-trib

Oct 26, 2017 @ 12:44
0
Morten,

correct, was thinking of a workaround because you have different child doc types. Another solution that I was thinking of was casting to (dynamic):
```
@foreach((dynamic) product in Model.Content.Children) {

    <img src="product.OverviewImage.First().Url" />

} 
```
Was just going to test this out, but maybe it will be faster if you tried this?

/Michaël
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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:49

0

''System.Collections.Generic.List

Nor does it have a definition for Url. This is odd, because I'm sure List has a definition for First().

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 12:57
101
Okay. I was able to resolve this by doing:
```
@foreach(var product in Model.Content.Children) {
    dynamic image = product;
    <img src="@image.OverviewImage[0].Url" />
}
```
and that also means my Vorto values work simply by doing product.GetVortoValue("overviewDescription").

Excellent. So it's a workaround, but it works I guess. Thanks!
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Michaël Vanbrabandt 863 posts 3348 karma points c-trib

Oct 26, 2017 @ 12:58

0

Hi Morten,

glad that you have solved it!

Have a nice day

/Michaël

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Morten 105 posts 345 karma points

Oct 26, 2017 @ 13:01

0

Thank you, you too!

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How to access composite values on different doctypes? Getting an "Unable to cast" error