/// <summary>
/// Executes the NHibernate query and initializes the lazy proxies before serialization
/// </summary>
/// <param name="actionExecutedContext"></param>
public override void OnActionExecuted(System.Web.Http.Filters.HttpActionExecutedContext actionExecutedContext)
{
if (actionExecutedContext.Response == null)
{
return;
}
object responseObject;
if (actionExecutedContext.Response == null || !actionExecutedContext.Response.TryGetContentValue(out responseObject))
{
return;
}
if (responseObject is IQueryable)
{
var nhQueryable = responseObject as IQueryableInclude;
if (nhQueryable != null)
{
// perform expansion based on the Include() clauses
var includes = nhQueryable.GetIncludes();
if (includes != null)
{
this.ApplyExpansions(nhQueryable, includes, actionExecutedContext.Request);
}
}
var returnType = actionExecutedContext.ActionContext.ActionDescriptor.ReturnType;
if (typeof(IEnumerable).IsAssignableFrom(returnType))
{
// Apply $select and $expand in the base class
base.OnActionExecuted(actionExecutedContext);
if (!actionExecutedContext.Response.TryGetContentValue(out responseObject))
{
return;
}
var queryResult = responseObject as QueryResult;
if (queryResult != null)
{
responseObject = queryResult.Results;
}
var list = Enumerable.ToList((dynamic)responseObject);
var expandMap = GetRequestProperty(actionExecutedContext.Request, EXPAND_MAP_KEY) as ExpandTypeMap;
// Initialize the NHibernate proxies
NHInitializer.InitializeList(list, expandMap);
if (queryResult != null)
{
// Put the results in the existing wrapper
queryResult.Results = list;
}
else
{
// replace the IQueryable with the executed list, so it won't be re-executed by the serializer
var formatter = ((dynamic)actionExecutedContext.Response.Content).Formatter;
var oc = new ObjectContent(list.GetType(), list, formatter);
actionExecutedContext.Response.Content = oc;
}
}
else
{
// Execute the query for a non-enumerable type
var result = Enumerable.ToList((dynamic)responseObject);
// replace the IQueryable with the executed list, so it won't be re-executed by the serializer
var formatter = ((dynamic)actionExecutedContext.Response.Content).Formatter;
var oc = new ObjectContent(result.GetType(), result, formatter);
actionExecutedContext.Response.Content = oc;
}
}
// Even with no IQueryable, we still need to configure the formatter to prevent runaway serialization.
ConfigureFormatter(actionExecutedContext.Request);
}
/// <summary>
/// Perform the lazy loading allowed in the expandMap.
/// </summary>
/// <param name="list"></param>
public override IEnumerable PostExecuteQuery(IEnumerable list)
{
NHInitializer.InitializeList(list, expandMap);
return(list);
}
