MDrivenServer - how to expose viewmodel as a REST service - mdriven

Question

I use standalone MDrivenServer.
Question - is it possible to expose a viewmodel as a REST service in this configuration without MDrivenTurnkey installation, e.g. using url like ...Rest/Get?command=vmname&id=rootobjref ?
Thank you!

Answer 1

No the MDrivenServer has only the persistence mapper api's exposed. In order to simulate a viewmodel driven rest get-service you can go like this in a MVC application:
Derive your controller from ModelDrivenControllerBase<ESType>
/// <summary>
/// command should match a viewmodel, id should be external id for root or $null$
/// will try and match extra params to viewmodel variables
/// will execute actions on root level
/// will return complete vm on success as json except if string attribute RawJSon is found - then this is returned instead
/// </summary>
public virtual ActionResult Get(string command, string id)
{
Eco.ObjectRepresentation.IModifiableVariableList vars = FindAdditionalRequestParamsAndTreatAsVars();
if (string.IsNullOrEmpty(id))
id = ObjectId.nulltoken;
SaveVariablesToSessionState(command, id, vars);
VMClass onlinevm = CreateVMClassFromName(command, id);
if (onlinevm != null)
{
if (!CheckRestAllowed(onlinevm)) <-- turnkey checks the rest allowed flag
return Content("Must set RestAllowed on VM " + command);
foreach (var col in onlinevm.ViewModelClass.Columns)
{
if (col.IsAction)
{
col.ViewModel.ExecuteAction(col.ViewModelClass.RuntimeName, col.RuntimeName);
}
}
return GetJsonFromVm(onlinevm); <-- this can be implemented with the Tajson concept: https://wiki.mdriven.net/index.php/Tajson
}
else
return Content("Access denied");
}
/// <summary>
/// targetViewRootObject may be both string and IEcoObject.
/// If the newrootAsObject happens to be a guid string - and the IClass has a property guid - then we will try and PS-resolve the guid and use it as root
/// </summary>
protected VMClass CreateVMClassFromName(string targetViewName, object targetViewRootObject)
{
EnsureEcoSpace();
if (targetViewRootObject is string)
targetViewRootObject = SafeObjectForId((string)targetViewRootObject);
VMClass createdVMClass = ViewModelHelper.CreateFromViewModel(targetViewName, EcoSpace, targetViewRootObject as IEcoObject, false);
IEcoObject root = targetViewRootObject as IEcoObject;
if (root == null && createdVMClass.ViewModelClass.IClass is IClass && targetViewRootObject is string)
{
// Handle special case of a GUID as target
// Used to act on direct links for an object
if (targetViewRootObject is string)
{
root = EcoSpace.ExternalIds.ObjectForUnkownId(targetViewRootObject as string, createdVMClass.ViewModelClass.IClass as IClass);
if (root != null)
createdVMClass.Content = root.AsIObject();
}
}
bool vm_visibleDueToAccessGroups = createdVMClass.ViewModelClass.ViewModel.VisibleDueToAccessGroups(EcoSpace, root != null ? root.AsIObject() : null);
if (!vm_visibleDueToAccessGroups)
{
return null;
}
LoadVariablesFromSessionStateIfAvailable(targetViewName, SafeIDForObject(targetViewRootObject), createdVMClass.Variables);
return createdVMClass;
}