public void SaveReview(ReviewEntity review)
{
// It's not a new review. Update the value.
var recipe = Context
.Recipes
.FirstOrDefault(r => r.RecipeId == review.RecipeId);
if (recipe == null)
{
throw new InvalidOperationException(
"Cannot save review without a recipe.");
}
// It's a new review.
if (review.ReviewId == 0)
{
var modelReview = new Review();
AssignEntityToModel(review, modelReview);
var userProfile = new UserProfile();
userProfile.UserId = review.Reviewer.UserId;
userProfile.UserName = review.Reviewer.UserName;
this
.Context
.UserProfiles
.Attach(userProfile);
modelReview.Reviewer = userProfile;
recipe.Reviews.Add(modelReview);
Context.SaveChanges();
review.ReviewId = modelReview.ReviewId;
return;
}
// Add the review to the recipe.
var oldReviewModel = recipe
.Reviews
.FirstOrDefault(r => r.ReviewId == review.ReviewId);
if (oldReviewModel == null)
{
throw new ArgumentOutOfRangeException("review",
"Cannot edit the review as it cannot be located.");
}
AssignEntityToModel(review, oldReviewModel);
Context.SaveChanges();
}
private ReviewListViewModel ToListModel(ReviewEntity review)
{
return new ReviewListViewModel
{
Comment = review.Comment,
Rating = review.Rating,
Reviewer = review.Reviewer.UserName,
};
}
private void AssignEntityToModel(ReviewEntity reviewEntity, Review reviewModel)
{
if (reviewEntity == null)
{
return;
}
if (reviewModel == null)
{
throw new ArgumentNullException(
"dbReview",
"You cannot assign a review to a null model.");
}
reviewModel.Rating = reviewEntity.Rating;
reviewModel.Comment = reviewEntity.Comment;
}