Class ScalarValueQueryInterceptor

Namespace

Trellis.EntityFrameworkCore

Assembly

Trellis.EntityFrameworkCore.dll

An EF Core query expression interceptor that enables natural scalar value object syntax in LINQ queries — comparisons, string methods, and properties translate to SQL without requiring .Value.

public sealed class ScalarValueQueryInterceptor : IQueryExpressionInterceptor, ISingletonInterceptor, IInterceptor

Inheritance

object

ScalarValueQueryInterceptor

Implements

IQueryExpressionInterceptor

ISingletonInterceptor

IInterceptor

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Extension Methods

MaybeExtensions.AsMaybe<T>(T)

MaybeExtensions.ToResult<TValue>(TValue)

NullableExtensions.ToResult<T>(T?, Func<Error>)

NullableExtensions.ToResult<T>(T?, Error)

AggregateTestMutator.ClearMaybeField<TEntity, TValue>(TEntity, Expression<Func<TEntity, Maybe<TValue>>>)

AggregateTestMutator.SetMaybeField<TEntity, TValue>(TEntity, Expression<Func<TEntity, Maybe<TValue>>>, TValue?)

Examples

With this interceptor registered, these LINQ expressions work directly:

// Natural value object syntax — no .Value needed
context.Customers.Where(c => c.Name == "Alice");
context.Customers.Where(c => c.Name.StartsWith("Al"));
context.Customers.Where(c => c.Name.Length > 3);
context.Customers.OrderBy(c => c.Name);

// Specifications with domain types
public override Expression<Func<TodoItem, bool>> ToExpression() =>
    todo => todo.Status == TodoStatus.Active && todo.DueDate < _asOf;

Remarks

Register via optionsBuilder.AddTrellisInterceptors() — this registers both the MaybeQueryInterceptor and this interceptor.

Methods

QueryCompilationStarting(Expression, QueryExpressionEventData)

Rewrites the query expression tree before compilation, converting scalar value object expressions to forms that EF Core can translate to SQL.

public Expression QueryCompilationStarting(Expression queryExpression, QueryExpressionEventData eventData)

Parameters

queryExpression Expression

eventData QueryExpressionEventData

Returns

Expression