How can i make an EFCORE Entity ValueGenerated Property value be used when querying using linq query with .where(), instead of the database value.
https://learn.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.valuegeneration.valuegenerator?view=efcore-8.0
Ex: instead of directly translating from linq to sql with
(canApprove == true)
it should use in:
((Approved == null && Configuration.MaxNumber > 1) == true).
Since is the value generator logic in the class
public class Event
{
public Configuration Configuration {get; set;}
public bool CanApprove
{
get => canApprove();
private set => _canApprove = value;
}
protected virtual bool canApprove() => Approved == null && Configuration.MaxNumber > 1;
}
builder.Property(e => e.CanApprove)
.HasValueGenerator<ValueGeneratorEventCanApprove >()
.UsePropertyAccessMode(PropertyAccessMode.Property);`
class ValueGeneratorEventCanApprove: Microsoft.EntityFrameworkCore.ValueGeneration.ValueGenerator
{
public override bool GeneratesTemporaryValues => false;
protected override object NextValue(EntityEntry entry) => ((Event)entry.Entity).CanApprove;
}
_context.Events.Where((e) => e.CanApprove == true)
This shoud be translated to sql as:
((Approved == null && Configuration.MaxNumber > 1) == true)
instead of
`(canApprove == true)`
I cant find any solution different to try unless filter by using the background fields used in the logic of .canApprove.
var query = context.Events
.Where(e => e.Approved == null && e.Configuration.MaxNumber > 1)
.Select(e => new
{
Event = e,
CanApprove = e.Approved == null && e.Configuration.MaxNumber > 1
})
.Where(e => e.CanApprove)
.Select(e => e.Event);
Or
_context.Events.Where((e) => e.Approved == true && e.Configuration.MaxNumber> 1)
Boath approaches are not good for maintanable purposes since canApprove logic is quite complex, and used in many places.
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