public static KeywordViewModel CreateFromKeyword(Keyword k)
{
KeywordViewModel keywordViewModel = new KeywordViewModel
{
Keyword = k.KeywordText,
};
return keywordViewModel;
}
public ActionResult Edit(Keyword model)
{
ViewBag.KeywordAdminActive = true;
if (ModelState.IsValid)
{
if (model.KeywordText != null)
{
if (model.KeywordText.Trim() != "")
{
Keyword oldKeyword = db.Keywords.Find(model.ID);
String modelKeywordTextLowerCase = model.KeywordText.ToLower();
Keyword versionOfNewKeywordInDB = findKeywordFromText(model.KeywordText);
if (oldKeyword.KeywordText.ToLower().Equals(modelKeywordTextLowerCase))
{
oldKeyword.KeywordText = model.KeywordText;
}
else
{
if (versionOfNewKeywordInDB != null)
{
removeOldKeywordFromQuestions(versionOfNewKeywordInDB, oldKeyword);
db.Keywords.Remove(oldKeyword);
}
else
{
oldKeyword.KeywordText = model.KeywordText;
}
}
db.SaveChanges();
RouteValueDictionary routeValueDictionary = new RouteValueDictionary();
routeValueDictionary.Add("page", 1);
return RedirectToAction("Index", "KeywordsAdmin", routeValueDictionary);
}
else
{
ModelState.AddModelError("", "Keyword needs characters other than space(s).");
return View(model);
}
}
else
{
ModelState.AddModelError("", "Keyword cannot be empty.");
return View(model);
}
}
else
{
ModelState.AddModelError(model.KeywordText, "Keyword cannot be edited.");
return View(model);
}
}
/// <summary> Helper method to remove all of the references to the old keyword and change it to all the references to the new keyword </summary>
/// <param name="newKeyword"> The new keyword that we want the references to point to </param>
/// <param name="oldKeyword"> The old keyword that we want to remove all references to </param>
/// <returns> None </returns>
private void removeOldKeywordFromQuestions(Keyword newKeyword, Keyword oldKeyword)
{
DbSet<Question> allQuestions = db.Questions;
String newKeywordTestLowerCase = newKeyword.KeywordText.ToLower();
foreach (Question q in allQuestions)
{
List<Keyword> keywordsInQuestion = q.Keywords;
foreach (Keyword k in keywordsInQuestion)
{
String lowerCaseCurKeyword = k.KeywordText.ToLower();
if (k.KeywordText.Equals(newKeywordTestLowerCase))
{
q.Keywords.Remove(oldKeyword);
q.Keywords.Add(newKeyword);
break;
}
}
}
}