✨ Featured posts

pkg/internal/services/featured.go

@@ -0,0 +1,40 @@
+package services
+
+import (
+	"git.solsynth.dev/hypernet/interactive/pkg/internal/database"
+	"git.solsynth.dev/hypernet/interactive/pkg/internal/models"
+	"time"
+)
+
+// GetFeaturedPosts How to determine featured posts?
+// Get the most upvoted posts in the last 7 days
+// And then how to get the upvote count of each post in the last 7 days?
+// We will get the reactions that attitude equals to 1 and created within the last 7 days
+// By the way, the upvote count will subtract the downvote count
+// Notice, this function is a raw query, it is not recommended to return the result directly
+// Instead, you should get the id and query it again via the ListPost function
+func GetFeaturedPosts(count int) ([]models.Post, error) {
+	deadline := time.Now().Add(-7 * 24 * time.Hour)
+
+	var posts []models.Post
+	if err := database.C.Raw(`
+		SELECT p.*
+        FROM posts p
+        JOIN (
+            SELECT
+                post_id,
+                SUM(CASE WHEN attitude = 1 THEN 1 ELSE 0 END) -
+                SUM(CASE WHEN attitude = 2 THEN 1 ELSE 0 END) AS social_points
+            FROM reactions
+            WHERE created_at >= ?
+            GROUP BY post_id
+            ORDER BY social_points DESC
+            LIMIT ?
+        ) t ON p.id = t.post_id
+        ORDER BY t.social_points DESC, p.published_at DESC
+    `, deadline, count).Scan(&posts).Error; err != nil {
+		return posts, err
+	}
+
+	return posts, nil
+}