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Extend visitor of async provider to support ExecuteDelete and ExecuteUpdate #57

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Extend visitor of async provider to support ExecuteDelete and ExecuteUpdate #57

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33 changes: 29 additions & 4 deletions src/EntityFrameworkCoreMock.Shared/DbAsyncQueryProvider.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -69,10 +69,35 @@ public TResult ExecuteAsync<TResult>(Expression expression, CancellationToken ca

private static T CompileExpressionItem<T>(Expression expression)
=> Expression.Lambda<Func<T>>(
body: new Visitor().Visit(expression) ?? throw new InvalidOperationException("Visitor returns null"),
parameters: (IEnumerable<ParameterExpression>) null)
.Compile()();
body: new Visitor().Visit(expression) ?? throw new InvalidOperationException("Visitor returns null"),
parameters: (IEnumerable<ParameterExpression>) null)
.Compile()();

private class Visitor : ExpressionVisitor { }
private class Visitor : ExpressionVisitor
{
protected override Expression VisitMethodCall(MethodCallExpression node)
{
var method = node.Method;
if (method.DeclaringType?.FullName == "Microsoft.EntityFrameworkCore.RelationalQueryableExtensions")
{
var fakeMethod = GetType().GetMethod(method.Name);
if (fakeMethod != null)
{
var obj = Visit(node.Object);
var args = Visit(node.Arguments);
return Expression.Call(obj, fakeMethod.MakeGenericMethod(method.GetGenericArguments()), args);
}
}
return base.VisitMethodCall(node);
}

// ReSharper disable once UnusedMember.Local
public static int ExecuteDelete<TSource>(IQueryable<TSource> source) =>
source.Count();

// ReSharper disable once UnusedMember.Local
public static int ExecuteUpdate<TSource>(IQueryable<TSource> source) =>
source.Count();
}
}
}