protected override Expression VisitMemberAccess(MemberExpression memberExpression)
{
MemberExpression expression;
var visited = new List<MemberExpression>();
var root = memberExpression.Expression.StripForIncludeScanning();
var memberIsDataAccessObjectGatheringForProjection = false;
// Don't perform implicit joins for RelatedDataAccessObject collections as those currently turn into N+1 queries
if (this.nesting < 1 && (memberExpression.Type.GetSequenceElementType()?.IsDataAccessObjectType() ?? false))
{
return base.VisitMemberAccess(memberExpression);
}
if (memberExpression.Type.IsTypeRequiringJoin())
{
if (this.forProjection)
{
memberIsDataAccessObjectGatheringForProjection = true;
expression = memberExpression.StripForIncludeScanning() as MemberExpression;
}
else
{
expression = memberExpression.Expression.StripForIncludeScanning() as MemberExpression;
if (expression == null || !expression.Expression.StripForIncludeScanning().Type.IsTypeRequiringJoin())
{
return memberExpression;
}
}
}
else
{
if (memberExpression.Expression?.StripForIncludeScanning() == null)
{
return memberExpression;
}
var typeDescriptor = this.model.TypeDescriptorProvider.GetTypeDescriptor(memberExpression.Expression.StripForIncludeScanning().Type);
if (typeDescriptor == null)
{
return Expression.MakeMemberAccess(this.Visit(memberExpression.Expression.StripForIncludeScanning()), memberExpression.Member);
}
var property = typeDescriptor.GetPropertyDescriptorByPropertyName(memberExpression.Member.Name);
if (property.IsPrimaryKey && memberExpression.Expression.StripForIncludeScanning() is MemberExpression)
{
expression = ((MemberExpression)memberExpression.Expression.StripForIncludeScanning()).Expression.StripForIncludeScanning() as MemberExpression;
}
else
{
expression = memberExpression.Expression.StripForIncludeScanning() as MemberExpression;
}
}
var currentExpression = expression.StripForIncludeScanning() as MemberExpression;
while (currentExpression?.Member is PropertyInfo)
{
visited.Add(currentExpression);
root = currentExpression.Expression.StripForIncludeScanning();
currentExpression = root as MemberExpression;
if (currentExpression == null)
{
root = this.GetExpression(root).StripForIncludeScanning();
currentExpression = root as MemberExpression;
}
}
var includedPathSkip = 0;
var i = 0;
foreach (var current in visited)
{
if (!current.Member.ReflectedType.IsTypeRequiringJoin()
|| current == this.currentParent /* @see: Test_Select_Project_Related_Object_And_Include1 */)
{
includedPathSkip = visited.Count - i;
break;
}
i++;
}
visited.Reverse();
i = 0;
currentExpression = expression;
while (currentExpression?.Member is PropertyInfo)
{
var path = new PropertyPath(c => c.Name, visited.Select(c=> (PropertyInfo)c.Member).Take(visited.Count - i).ToArray());
ReferencedRelatedObject objectInfo;
if (path.Length == 0)
{
break;
}
if (!path.Last.ReflectedType.IsTypeRequiringJoin())
{
this.rootExpressionsByPath[path] = currentExpression;
break;
}
if (!this.results.TryGetValue(path, out objectInfo))
{
var includedPropertyPath = new PropertyPath(c => c.Name, path.Skip(includedPathSkip));
objectInfo = new ReferencedRelatedObject(path, includedPropertyPath, sourceParameterExpression);
this.results[path] = objectInfo;
}
this.referencedRelatedObjects.Add(objectInfo);
if (memberIsDataAccessObjectGatheringForProjection)
{
objectInfo.TargetExpressions.Add(currentExpression);
}
else if (currentExpression == expression)
{
objectInfo.TargetExpressions.Add(expression);
}
i++;
currentExpression = currentExpression.Expression.StripForIncludeScanning() as MemberExpression;
}
return memberExpression;
}