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sl8er

•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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