Content Type, "Bag" Parts: how to limit the number of items a user can create in a "Bag" Parts?

[MarGraz]

Hi everyone,

I've created a Content Type named User, which I intend to use in an Orchard Core headless microservice. This service will enrich the user information provided by the SSO microservice. The User content type should be similar to the following JSON structure:

{
  "SsoUserId": "ajaolkaolk2",
  "Information": {
    "ContactPerson": "Name",
    "Email": "email@example.com",
    "Phone": "123456789",
    "Street": "Pippo Blvd",
    "StreetNumber": "20",
    "City": "Pluto",
    "ZipCode": "12345",
    "Logo": "https://www.example.com/logo.jpg"
  }
}

Additionally, I've created an Information content type. In the User content type, I've added a bag part, as shown here:

Within the bag settings, I've chosen to include the Information content type:

Now from the backend I can create multiple Information items, but I only need one.

I used a bag to prevent direct creation of the Information content type and to avoid to use a picker in the User content type.

1. Is there a way to restrict the creation to just one Information item per user?
2. Would implementing a ContentHandlerBase class be a solution, or is there another method to achieve this from the backend?

Thank you

[douwinga]

Should be able to add the settings using a settings display driver for the BagPart public class BagPartMinMaxSettingsDisplayDriver : ContentTypePartDefinitionDisplayDriver<BagPart> and add it to the startup services.AddScoped<IContentTypePartDefinitionDisplayDriver, BagPartMinMaxSettingsDisplayDriver>();. Then validate using a ContentPartHandler or in the UpdateAsync method of an additional ContentPartDisplayDriver<BagPart>. You could also override the edit view for bag parts to add some javascript to validate on the client browser too.

We did a feature like this at work and it works well, but our needs are different from most peoples. Definitely doable though.

[MarGraz]

@douwinga, thank you for your reply.

By using ContentTypePartDefinitionDisplayDriver<BagPart>, I will end up displaying the max and min setting fields when creating a new User item on the "Content" > "Content Items" User page, correct?

If yes, I would prefer not to show these settings there. Instead, I prefer to include the min and max settings on the Bag edit page (as we discussed here), and then performing the validation when a new User is submitted.

To clarify, my intention is to add the max and min fields to the Bag edit page, as shown here:

I plan to proceed with implementation if this approach is correct.

Thank you

[MarGraz]

@douwinga in the previous comment I confused the ContentTypePartDefinitionDisplayDriver<BagPart> you suggested, with the ContentPartDisplayDriver<MyPart>.

So using ContentTypePartDefinitionDisplayDriver<BagPart> I should be able to add the max and min fields to the Bag edit page.
I'll start working on implementing this.

Thank you

[douwinga]

The ContentTypePartDefinitionDisplayDriver<BagPart> -> Edit / EditAsync methods will build a shape that will show on the bag part settings page.

[MarGraz]

@douwinga it works, for the Edit method override I took inspiration from the BagPartSettingsDisplayDriver class here, and it works, as you can see with a placeholder text:

How can I know all the available locations to move my CustomBagPartSettings.Edit.cshtml from the bottom of the page?

For what I see, in the ContentTypeDefinition > Parts > Settings property, there's an object that contains a Position number. Is this the right way to find the available locations?
Here an image of what I saw:

Find the positions can be very tricky. Could be nice to have a feature for both frontend and backend, that when turned on, shows the available positions of each shape. Other CMS like Joomla has this feature, here an example of "Module Map":

About the placement topic I also opened this discussion some days ago.

Thank you

[douwinga]

I do not know the best way to find where things can be placed. It depends on the theme, so I guess you would have to look there if the theme doesn't provide a diagram like you have in your screenshot. Maybe Design -> Widgets in the admin gives a clue for the built in themes, but I honestly just don't know how people are expected to figure that out without just looking at the theme view files.

As for the position, you can include that with your location like .Location("Content:6") where 6 is the position number. So if there are items in positions 1-5 then this item will be in the 6th position.