public bool DealExists(Deal deal){
var builder = Builders<BsonDocument>.Filter;
var filter = builder.Eq ("product_name", deal.product_name) &
builder.Eq ("store_name", deal.store_name) &
builder.Eq ("expiry_date", deal.expiry_date) &
builder.Eq ("price", deal.price);
return deals_collection.Find (filter).ToList().Count != 0;
}
public bool AddDeal(string user, Deal deal){
string user_name = DbUtils.GetUserName (user);
if (user_name.Equals(DbUtils.NO_SUCH_USER))
return false;
if (DealExists (deal)) {
return false;
}
deal.submitter_name = user_name;
var document = deal.ToBsonDocument ();
deals_collection.InsertOne (document);
return true;
}