2 files changed, 92 insertions, 0 deletions
diff --git a/src/models/likes.rs b/src/models/likes.rs
new file mode 100644
index 0000000..56001d9
--- /dev/null
+++ b/src/models/likes.rs
@@ -0,0 +1,91 @@
+use crate::{db::get_client, errors::AppError};
+use chrono::{Local, NaiveDateTime};
+use serde::{Deserialize, Serialize};
+use sqlx::Row;
+
+/// Likes model
+#[derive(Serialize, Deserialize, sqlx::FromRow)]
+pub struct Like {
+    id: i32,
+    user_id: i32,
+    model_id: i32,
+    created: NaiveDateTime,
+}
+
+impl Like {
+    /// Create a new like
+    pub fn new(user_id: i32, model_id: i32) -> Self {
+        let now = Local::now().naive_utc();
+        Self {
+            id: 0,
+            user_id,
+            model_id,
+            created: now,
+        }
+    }
+
+    /// Returns `true` if an user has already assigned a like to a model
+    pub async fn exists(&self) -> Result<bool, AppError> {
+        let pool = unsafe { get_client() };
+        let cursor = sqlx::query(
+            r#"
+                SELECT COUNT(id) as count FROM likes WHERE user_id = $1 AND model_id = $2
+            "#,
+        )
+        .bind(self.user_id)
+        .bind(self.model_id)
+        .fetch_one(pool)
+        .await?;
+
+        let count: i64 = cursor.try_get(0).unwrap();
+
+        Ok(count > 0)
+    }
+
+    /// Save new like into db
+    pub async fn save(&self) -> Result<Like, AppError> {
+        let pool = unsafe { get_client() };
+
+        if self.exists().await? {
+            return Err(AppError::BadRequest(
+                "This user already likes this model".to_string(),
+            ));
+        }
+
+        let rec: Like = sqlx::query_as(
+            r#"
+            INSERT INTO likes (user_id, model_id, created)
+            VALUES ($1, $2, $3)
+            RETURNING *
+            "#,
+        )
+        .bind(self.user_id)
+        .bind(self.model_id)
+        .bind(self.created)
+        .fetch_one(pool)
+        .await?;
+
+        Ok(rec)
+    }
+
+    /// Remove a like
+    pub async fn remove(&self) -> Result<(), AppError> {
+        let pool = unsafe { get_client() };
+
+        if !self.exists().await? {
+            return Err(AppError::NotFound("Like not found".to_string()));
+        }
+
+        sqlx::query(
+            r#"
+            DELETE FROM likes WHERE user_id = $1 AND model_id = $2
+            "#,
+        )
+        .bind(self.user_id)
+        .bind(self.model_id)
+        .execute(pool)
+        .await?;
+
+        Ok(())
+    }
+}
diff --git a/src/models/mod.rs b/src/models/mod.rs
index 45a11f3..8062fe3 100644
--- a/src/models/mod.rs
+++ b/src/models/mod.rs
@@ -1,4 +1,5 @@
 pub mod auth;
+pub mod likes;
 pub mod model;
 pub mod user;
 pub mod warning;