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•Created by sl8er on 2/23/2025 in #questions

Dependent select boxes in form

I'm using TanStack Query to fetch a configuration from an API. Once fetched, I'd like to populate two select boxes with the first available configuration in the response. options is an alias for the data returned by useQuery. Both vehicle_type and validity are initially set to "" (empty string). form comes from useForm (React Hook Form).

useEffect(() => {
  const vehicleType = form.getValues("vehicle_type");
  if (options && !vehicleType) {
    const firstVehicleType = options.vehicle_types[0];
    const firstValidity = firstVehicleType.validities[0];
    form.setValue("vehicle_type", firstVehicleType.type);
    form.setValue("validity", firstValidity);
  }
}, [options, form]);

useEffect(() => {
  const vehicleType = form.getValues("vehicle_type");
  if (options && !vehicleType) {
    const firstVehicleType = options.vehicle_types[0];
    const firstValidity = firstVehicleType.validities[0];
    form.setValue("vehicle_type", firstVehicleType.type);
    form.setValue("validity", firstValidity);
  }
}, [options, form]);

vehicle_type gets set correctly, but validity doesn't, or at least the value isn't rendered / changing its value does not trigger a re-render? There must be some fundamental thing I don't get here.

2 replies

CC#

•Created by sl8er on 1/28/2025 in #help

Binding case-insensitive query parameter to string enum in .NET 9 Minimal API

I have an order query parameter that I'd like to bind to an Order enum in a minimal API endpoint ([FromQuery] Order order = Order.Desc).

[JsonConverter(typeof(JsonStringEnumConverter))]
public enum Order
{
    [JsonStringEnumMemberName("asc")] Asc,

    [JsonStringEnumMemberName("desc")] Desc
}

[JsonConverter(typeof(JsonStringEnumConverter))]
public enum Order
{
    [JsonStringEnumMemberName("asc")] Asc,

    [JsonStringEnumMemberName("desc")] Desc
}

I'd like to accept all values like "ASC", "asc", "Asc", but currently only "Asc" and "Desc" work. I get a bad request with Microsoft.AspNetCore.Http.BadHttpRequestException: Failed to bind parameter "Order order" from "desc".

5 replies

CC#

•Created by sl8er on 1/9/2025 in #help

Overriding appsettings.json section with environment variable

Given a configuration section called Tenants, I'd like to override it with a whole JSON structure via an environment variable. Given I want this

"Tenants": {
  "ByCode": {
    "11": {
      "Name": "acme"
    },
    "42": {
      "Name": "silver"
    }
  }
}

"Tenants": {
  "ByCode": {
    "11": {
      "Name": "acme"
    },
    "42": {
      "Name": "silver"
    }
  }
}

I'm doing

export Tenants='{"ByCode": {"11": {"Name": "acme"}, "42": {"Name": "silver"}}}'

export Tenants='{"ByCode": {"11": {"Name": "acme"}, "42": {"Name": "silver"}}}'

I'm trying to bind it against an object with the options pattern:

builder.Services.Configure<TenantsOptions>(
        builder.Configuration.GetSection(TenantsOptions.SectionName));

builder.Services.Configure<TenantsOptions>(
        builder.Configuration.GetSection(TenantsOptions.SectionName));

And the classes look like:

public class TenantsOptions
{
    public const string SectionName = "Tenants";

    public Dictionary<string, Tenant> ByCode { get; set; } = new();
}

public class Tenant
{
    public string Name { get; set; }
}

public class TenantsOptions
{
    public const string SectionName = "Tenants";

    public Dictionary<string, Tenant> ByCode { get; set; } = new();
}

public class Tenant
{
    public string Name { get; set; }
}

When I run the ASP.NET Core app, the ByCode dictionary is empty. But if I just paste the JSON section in appsettings.json, it's correctly populated. For the record, I can see the whole structure if I just log builder.Configuration.GetSection(TenantsOptions.SectionName).Value;, but for some reason, I guess it's only interpreted as a string, and not correctly deserialized and bound to TenantOptions? So how do you actually override a whole section with a JSON value through an environment variable?

25 replies

CC#

•Created by sl8er on 5/27/2023 in #help

EF Core Many-to-One (Many Owned Entity to Non-owned Entity)

In the context of a multi-tenant application, I want to design an aggregate like so - a root Customer has a List<Address>, Address being an owned type. A Customer also references a Tenant. If I also want Address to reference a Tenant, it seems EF Core isn't happy when trying to configure a Tenant like so:

// This is fine.
builder
    .HasMany<Customer>()
    .WithOne(x => x.Tenant)
    .HasForeignKey("tenant_id")
    .IsRequired()
    .OnDelete(DeleteBehavior.Restrict);

// This throws - System.InvalidOperationException: The entity type 'Address' cannot be configured as non-owned because it has already been configured as a owned. Use the nested builder in `OwnsOne` or `OwnsMany` on the owner entity type builder to further configure this type. If you want to override previous configuration first remove the entity type from the model by calling 'Ignore'.
builder
    .HasMany<Address>()
    .WithOne(x => x.Tenant)
    .HasForeignKey("tenant_id")
    .IsRequired()
    .OnDelete(DeleteBehavior.Restrict);

// This is fine.
builder
    .HasMany<Customer>()
    .WithOne(x => x.Tenant)
    .HasForeignKey("tenant_id")
    .IsRequired()
    .OnDelete(DeleteBehavior.Restrict);

// This throws - System.InvalidOperationException: The entity type 'Address' cannot be configured as non-owned because it has already been configured as a owned. Use the nested builder in `OwnsOne` or `OwnsMany` on the owner entity type builder to further configure this type. If you want to override previous configuration first remove the entity type from the model by calling 'Ignore'.
builder
    .HasMany<Address>()
    .WithOne(x => x.Tenant)
    .HasForeignKey("tenant_id")
    .IsRequired()
    .OnDelete(DeleteBehavior.Restrict);

6 replies

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