private static MvcHtmlString DoFieldsInfoAwareEditor <TModel, TValue>(
HtmlHelper <TModel> html,
Expression <Func <TModel, TValue> > expression,
ModelFieldsAccessibility fieldsInfo,
Func <MvcHtmlString> displayDelegate
)
{
string property = html.PropertyName(expression);
if (!fieldsInfo.IsVisible(property))
{
return(MvcHtmlString.Empty);
}
ViewDataDictionary viewData = html.ViewDataContainer.ViewData;
List <string> dataKeysToRemove = new List <string>();
Dictionary <string, object> dataPrevValues = new Dictionary <string, object>();
// "Hide" current fields info from new editor
viewData.PrepareChangeReversal(FormConstants.FieldsInfoKey, dataKeysToRemove, dataPrevValues);
viewData.Remove(FormConstants.FieldsInfoKey);
// Augment new additionalViewData with information from fieldsInfo
if (fieldsInfo.IsComplex(property))
{
viewData[FormConstants.FieldsInfoKey] = fieldsInfo.GetSubFieldInfo(property);
}
else if (!fieldsInfo.CanBeChangedByUser(property))
{
viewData.PrepareChangeReversal(FormConstants.DisabledKey, dataKeysToRemove, dataPrevValues);
viewData[FormConstants.DisabledKey] = true;
}
// Render the editor
MvcHtmlString result = displayDelegate();
// Reverse the changes to ViewData
dataKeysToRemove.ForEach(s => viewData.Remove(s));
dataPrevValues.ForEach(pair => viewData[pair.Key] = pair.Value);
return(result);
}
public ActionResult Edit(int id)
{
Election election = db.Elections.Find(id);
if (election == null)
{
return(HttpNotFound());
}
CouncilElectionData councilData = null;
CouncilElectionForm councilForm = null;
ElectionForm form;
if (election.Type == ElectionType.StudentCouncil)
{
councilData = db.CouncilElectionData.First(data => data.ElectionId == election.Id);
form = councilForm = GenerateFormForCouncil(election, councilData);
}
else
{
form = GenerateFormForCourseRep(election);
}
ModelFieldsAccessibility fieldsInfo = ElectionLifecycleInfo.GetWhatCanBeEditedCouncil(election);
ViewData[FormConstants.FieldsInfoKey] = fieldsInfo;
ViewBag.Election = election;
fieldsInfo.EnsureAllowedDefaultKind(
ModelFieldsAccessibility.Kind.Editable,
nameof(AdminElectionsController) + "." + nameof(Edit)
);
if (Request.HttpMethod.ToUpper() != "POST")
{
// Just show the template
return(View("Edit", form));
}
AntiForgery.Validate();
// Update the form based on data that we received
// ReSharper disable once ConvertIfStatementToNullCoalescingExpression - we need the compiler to specify different generic arguments
if (councilForm != null)
{
TryUpdateModel(councilForm);
}
else
{
TryUpdateModel(form);
}
// Get the original form so that we use old values for uneditable fields
CouncilElectionForm councilOriginalForm = null;
ElectionForm originalForm;
if (councilForm != null)
{
originalForm = councilOriginalForm = GenerateFormForCouncil(election, councilData);
}
else
{
originalForm = GenerateFormForCourseRep(election);
}
// Replace all uneditable values with old ones
fieldsInfo.ReplaceUneditableWithOldValues(form, originalForm);
// As the role IDs are sent from user, we need to make sure that they weren't changed
if (councilForm != null && fieldsInfo.CanBeChangedByUser(nameof(CouncilElectionForm.Roles)))
{
IEnumerable <int?> initialRoleIds = councilOriginalForm.Roles.Select(role => role.Id);
IEnumerable <int?> newRoleIds = councilForm.Roles.Select(role => role.Id);
if (!initialRoleIds.SequenceEqual(newRoleIds))
{
throw new Exception("The IDs of roles were changed by user input");
}
}
// Validate again (since some rules are relative to other fields and can be affected by operations above)
TryValidateModel(form);
// Ignore the failures from uneditable fields
this.RemoveIgnoredErrors(fieldsInfo);
if (!ModelState.IsValid)
{
// The validation failed so we just display the form again
return(View("Edit", form));
}
// Record the admin action
AdminActionRecord actionRecord = CreateActionRecord(election, AdminActionRecord.RecordType.Edit);
actionRecord.SetFormChangeSet(FormChangeSet.Generate(form, originalForm));
db.AdminActionRecords.Add(actionRecord);
// Validation passed with the fields that are allowed to change. Persist the changes
Mapper.Map(form, election);
if (councilData != null)
{
Mapper.Map(form, councilData);
}
db.SaveChanges();
BackgroundJob.Enqueue <SynchronizeDelayedJobsJob>(job => job.Execute(election.Id));
AuditLogManager.RecordElectionEdit(User, election);
return(RedirectToAction("Details", new { id }));
}