//Used for calculation of the rating of a business based on reviews
public void calculateRating(Review review)
{
int totalNumberOfReviews = 0;
int totalRating = 0;
List<Review> reviews = db.Reviews.ToList();
//Recalculate the combined review ratings
foreach (var item in reviews)
{
//If item is the same as the business currently being reviewed
if (item.BusinessID == review.BusinessID)
{
totalNumberOfReviews++;
totalRating += item.Rating;
}
}
Business b1 = new Business();
b1 = db.Businesses.Find(review.BusinessID);
//Check if there are no reviews to ensure there is no divide by 0 exception
if (totalNumberOfReviews == 0)
{
b1.CombinedReviewRating = 0;//Set to 0 if no reviews
}
else
{
b1.CombinedReviewRating = totalRating / totalNumberOfReviews;//Calculate average rating
}
db.Entry(b1).State = EntityState.Modified;
db.SaveChanges();
}
public ActionResult Create(Review review)
{
if (ModelState.IsValid)
{
//Set the user equal to the currently logged in user
foreach (var item in db.UserProfiles)
{
if (item.UserName == User.Identity.Name)
{
review.UserId = item.UserId;
}
}
//Set the user equal to the business currently being reviewed
foreach (var item in db.UserProfiles)
{
if (item.UserName == User.Identity.Name)
{
review.UserId = item.UserId;
}
}
//Assume business review for that user doesnt already exists
bool reviewAlreadyExists = false;
//Check to see if there is already a review for the business for the user.
List<Review> reviews = new List<Review>();
//Foreach Review check if there is reviews for the business
foreach (var item in db.Reviews)
{
if (item.BusinessID == review.BusinessID)
{
reviews.Add(item);
}
}
//Foreach review, check if the user has already added one.
foreach (var item in reviews)
{
if (item.UserId == review.UserId)
{
reviewAlreadyExists = true;
}
}
//Check if a review for this business from this user does not already exist
if (reviewAlreadyExists == true)
{
ModelState.AddModelError("", "You have already reviewed this business and may not add another review.");
}
else
{
//Add details
db.Reviews.Add(review);
db.SaveChanges();
//Update Rating for business
calculateRating(review);
return RedirectToAction("Index", "Business");
}
}
ViewBag.businessID = review.BusinessID;
return View(review);
}
public ActionResult Edit(Review review)
{
bool isYourReview = false;
if (ModelState.IsValid)
{
//Gets the currently logged in user
foreach (var item in db.UserProfiles)
{
if (item.UserName == User.Identity.Name)
{
//checks to see if they wrote the review
if (item.UserId == review.UserId)
{
isYourReview = true;
}
}
}
if (isYourReview == true)
{
db.Entry(review).State = EntityState.Modified;
db.SaveChanges();
//Update Rating for business
calculateRating(review);
return RedirectToAction("Index", "Business");
}
}
ModelState.AddModelError("", "You can only edit reviews that you wrote.");
ViewBag.businessID = review.BusinessID;
return View();
}
