fix answers api

migrations/0_init_schema.sql

@@ -24,5 +24,6 @@ CREATE TABLE IF NOT EXISTS question_tag (
 CREATE TABLE IF NOT EXISTS answers (
     id SERIAL PRIMARY KEY,
     question_id INT REFERENCES questions(id),
+    FOREIGN KEY (question_id) REFERENCES questions(id),
     content TEXT NOT NULL
 );

src/pg_store.rs

@@ -394,12 +394,12 @@ impl Store {
 
     // Add an answer entity
     pub async fn add_answer(&mut self, new_answer: NewAnswer) -> Result<Answer, String> {
-        let result =
-            sqlx::query("INSERT INTO answers VALUES ($1,$2) RETURNING id, content, question_id")
-                .bind(new_answer.content)
-                .bind(new_answer.question_id.to_string())
-                .fetch_one(&self.connection)
-                .await;
+        let query = "INSERT INTO answers (content, question_id) VALUES ($1,$2) RETURNING id, content, question_id";
+        let result = sqlx::query(query)
+            .bind(new_answer.content)
+            .bind(i32::from(new_answer.question_id))
+            .fetch_one(&self.connection)
+            .await;
         match result {
             Ok(pg_row) => Ok(Answer::new(
                 Store::id_to_u8(&pg_row, "id"),