recommending

mongodb.go

@@ -141,11 +141,12 @@ func getAllItems() ([]ItemModel, error) {
 	result := []ItemModel{}
 	iter := itemCollection.Find(nil).Limit(100).Iter()
 	err := iter.All(&result)
-	if err != nil {
-		//user not exist
-		return result, err
-	} else {
-		//user exist
 	return result, err
 }
+
+func getItemsNotActed(actedItems []string) ([]ItemModel, error) {
+	result := []ItemModel{}
+	iter := itemCollection.Find(bson.M{"id": bson.M{"$nin": actedItems}}).Limit(100).Iter()
+	err := iter.All(&result)
+	return result, err
 }

recommendations.go

@@ -6,18 +6,16 @@ import (
 	"github.com/fatih/color"
 )
 
-func getRecommendations(userid string, nrec int) {
+func getRecommendations(userid string, nrec int) []ItemModel {
-
-	fmt.Println(userid)
-	fmt.Println(nrec)
-
 	user, err := getUserById(userid)
 	check(err)
-	color.Blue("user: ")
-	fmt.Println(user)
 
-	items, err := getAllItems()
+	items, err := getItemsNotActed(user.Actions)
 	check(err)
-	color.Blue("all items: ")
+
+	//select nrec items from the items array
+
+	color.Blue("recommended items: ")
 	fmt.Println(items)
+	return items
 }

serverRoutes.go

@@ -65,9 +65,12 @@ func Recommendations(w http.ResponseWriter, r *http.Request) {
 	check(err)
 
 	//now, get recommendations
-	getRecommendations(userid, nrec)
+	items := getRecommendations(userid, nrec)
+	//convert []items struct to json
+	jItems, err := json.Marshal(items)
+	check(err)
 
-	fmt.Fprintln(w, "recommendations")
+	fmt.Fprintln(w, string(jItems))
 }
 func SelectItem(w http.ResponseWriter, r *http.Request) {
 	ipFilter(w, r)
@@ -80,6 +83,12 @@ func SelectItem(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintln(w, "item "+itemid+" not found")
 	}
 
+	//find user
+	user, err := getUserById(userid)
+	if err != nil {
+		fmt.Fprintln(w, "user "+userid+" not found")
+	}
+
 	//increase TActed in item
 	item.TActed = item.TActed + 1
 
@@ -88,12 +97,6 @@ func SelectItem(w http.ResponseWriter, r *http.Request) {
 	check(err)
 	fmt.Println(item)
 
-	//find user
-	user, err := getUserById(userid)
-	if err != nil {
-		fmt.Fprintln(w, "user "+userid+" not found")
-	}
-
 	//add item to []Actions of user
 	user.Actions = append(user.Actions, itemid)
 

tests.sh

@@ -19,6 +19,7 @@ echo "[selecting item by user]"
 echo http http://127.0.0.1:3056/selectItem/user1/item1
 http http://127.0.0.1:3056/selectItem/user1/item1
 
+echo "------------------"
 
 echo "[Getting recommendations for user]"
 echo http http://127.0.0.1:3056/user1/3