Modeling with Dynamic Properties and Form

Question

Modeling with Dynamic Properties and Form

Guillermo Perez 26

Hello and thank you for any help you may provide. I have a problem that is in my head for the past week and that I can't resolve and I will appreciate any help in resolving it.

In my head I would like to classify objects by category and sub-category, and have the sub-category have object properties according to the subtype... for example

OBJECT : Motorcycle => have name like "Harley Davidson 500 Street", etc

Category : Automotive > Subcategory : Motorcycle > THEN subcategory has a set of sub-properties like: Engine, Brand, Color, Price,

OBJECT Handbag => have name like "Gucci Guapisima Wherever Edition", etc

Category : Clothing and Apparel > Subcategory : Brand Handbags > THEN subcategory has a set of sub-properties like: Material, Size, Color, Price,

Not the way I see it is... Most of object share the majority of this structure, like all objects have name, all of them belong to a category and a sub-category, now the problem comes on how to setup properties for each sub-category... for example both objects share the Color and Price but not the other properties. How to make this non-hard-coded? in other words, we know some of the properties are shared between objects, how can we do a model like this and then put this into a form?

I could do a dictionary but in the end, how do I validate them in the form?

Thanks for any help you could provide me.

AgaveJoe 30,411 Reputation points

2022-01-29T12:38:05.633+00:00

This is a basic database normalization/design question.

now the problem comes on how to setup properties for each sub-category

You'll have a table that contains the property id and sub-category Id.

I could do a dictionary but in the end, how do I validate them in the form?

The database foreign key constraints handle the validation.
Anonymous

2022-02-02T09:01:41.353+00:00

Hi @Guillermo Perez ,

for example both objects share the Color and Price but not the other properties. How to make this non-hard-coded? in other words, we know some of the properties are shared between objects, how can we do a model like this and then put this into a form?

After according to the database normalization/design creates a model, you can refer to the following articles to configure relationships between models:

Relationships

Conventions in Entity Framework Core

Fluent API in Entity Framework Core.

Then, you can refer to Model validation in ASP.NET Core MVC and Razor Pages to do the model validation and refer to the Loading Related Data to load the data.

Best regards,
Dillion

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AgaveJoe 30,411 Reputation points

2022-01-29T12:38:05.633+00:00

This is a basic database normalization/design question.

now the problem comes on how to setup properties for each sub-category

You'll have a table that contains the property id and sub-category Id.

I could do a dictionary but in the end, how do I validate them in the form?

The database foreign key constraints handle the validation.
Anonymous

2022-02-02T09:01:41.353+00:00

Hi @Guillermo Perez ,

for example both objects share the Color and Price but not the other properties. How to make this non-hard-coded? in other words, we know some of the properties are shared between objects, how can we do a model like this and then put this into a form?

After according to the database normalization/design creates a model, you can refer to the following articles to configure relationships between models:

Relationships

Conventions in Entity Framework Core

Fluent API in Entity Framework Core.

Then, you can refer to Model validation in ASP.NET Core MVC and Razor Pages to do the model validation and refer to the Loading Related Data to load the data.

Best regards,
Dillion

Answer 1

Michael Washington 921 MVP

This may help: Blazor Tree Creator with Checkboxes

The NodeName and the IsSelected show how you can add properties to each element.
What this doesn't cover is associating those properties to other elements.

Guillermo Perez 26 Reputation points

2022-01-29T16:43:42.557+00:00

Thank you for the info but how do we develop this into a editform in blazor? we can have nested children but how do we make sense of this in a form? thank you for your advise.
Michael Washington 921 Reputation points MVP

2022-01-29T19:06:08.813+00:00

I only have one (uncomplete) project that uses it here: https://github.com/ADefWebserver/ADefHelpDesk

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Modeling with Dynamic Properties and Form

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