private LambdaExpression GetLambdaForEnumerableProperty <T>(IncludePathMetadataFragment includePathMetadataFragment, LambdaExpression filterLambda)
{
var lambdaType = typeof(Func <,>).GetGenericTypeDefinition().MakeGenericType(includePathMetadataFragment.DeclaringType, includePathMetadataFragment.PropertyType);
var memberParameter = (ParameterExpression)includePathMetadataFragment.PropertyAccessExpression.Expression;
var propertyLambda = Expression.Lambda(lambdaType, includePathMetadataFragment.PropertyAccessExpression, memberParameter);
return(SecurityExtensions.CombineCollectionPropertySelectorWithPredicate(propertyLambda, filterLambda));
}
public void ShouldReflectivelyUpdatePredicateForCollectionAccessors()
{
var data = new List <ExampleLeaf>
{
new ExampleLeaf
{
SecuredRoots = new[]
{
new ExampleRoot
{
Id = 1
}
}
},
new ExampleLeaf
{
SecuredRoots = new[]
{
new ExampleRoot
{
Id = 4
}
}
},
new ExampleLeaf
{
SecuredRoots = new[]
{
new ExampleRoot
{
Id = 5
}
}
}
};
Expression <Func <ExampleLeaf, IEnumerable <ExampleRoot> > > selector = x => x.SecuredRoots;
LambdaExpression selectorExpression = selector;
List <long> ids = new List <long> {
1, 2, 3
};
Expression <Func <ExampleRoot, bool> > predicate = x => ids.Contains(x.Id);
LambdaExpression predicateExpression = predicate;
// x => x.SecuredRoots.Any(c => ids.Contains(c.Id))
var resultingCombined = SecurityExtensions.CombineCollectionPropertySelectorWithPredicate(selectorExpression, predicateExpression);
var resultingPredicate = (Func <ExampleLeaf, bool>)resultingCombined.Compile();
var results = data.Where(resultingPredicate);
results.Should().HaveCount(1);
}