fix api for update question

src/api.rs

@@ -2,7 +2,7 @@
 use self::{
     answer::NewAnswer,
     pg_store::Store,
-    question::{NewQuestion, Question, QuestionDTO},
+    question::{NewQuestion, QuestionDTO},
 };
 use crate::*;
 const DEFAULT_PAGE: usize = 0;
@@ -85,6 +85,7 @@ pub async fn create_question(
 }
 
 /// Updates an existing question
+/// TODO: Better handle errors, responses in the tag updating flow - it is getting complex
 /// # Parameters
 /// `QuestionDTO` A JSON representation of a Question including its id
 /// # Returns
@@ -92,10 +93,55 @@ pub async fn create_question(
 /// Http Not Found 404 and a message are returned if a question with that `id` does not already exist
 /// Http Unprocessable Entity 422 is returned (implicitlly) for a malformed body
 pub async fn update_question(
-    State(_store): State<Arc<RwLock<Store>>>,
-    Json(_question): Json<Question>,
+    State(store): State<Arc<RwLock<Store>>>,
+    Json(question): Json<QuestionDTO>,
 ) -> Response {
-    todo!()
+    // 1: Update the question entity
+    let updated_question_result = store
+        .write()
+        .await
+        .update_question(question.id, question.title, question.content)
+        .await;
+    match updated_question_result {
+        Ok(updated_question) => {
+            // 2: Get the list of tags currently associated with this question
+            let current_tags_option = store
+                .read()
+                .await
+                .get_tags_for_question(updated_question.id)
+                .await;
+            match current_tags_option {
+                Some(current_tags) => {
+                    let incoming_tag_labels = question.tags;
+                    // Create (ignored if they already exist, new tags for the incoming tags)
+                    let incoming_tags = store
+                        .write()
+                        .await
+                        .add_tags(incoming_tag_labels)
+                        .await
+                        .unwrap();
+                    // Unassociated all current tags with this question
+                    let _remove_tags = store
+                        .write()
+                        .await
+                        .unassociate_tags(updated_question.id, current_tags)
+                        .await
+                        .unwrap();
+                    // Associated all of the incoming tags (now newly created if needed) with the question
+                    let _updated_tags = store
+                        .write()
+                        .await
+                        .associate_tags(updated_question.id, &incoming_tags)
+                        .await
+                        .unwrap();
+                    //Return the updated question with the updated tags
+                    QuestionDTO::new(updated_question, incoming_tags).into_response()
+                }
+                None => (StatusCode::OK).into_response(),
+            }
+        }
+        Err(e) => (StatusCode::CONFLICT, e).into_response(),
+    }
 }
 
 /// Delete an existing question

src/main.rs

@@ -43,7 +43,7 @@ async fn serve_file(uri: Uri) -> impl IntoResponse {
                 Err(_) => (StatusCode::INTERNAL_SERVER_ERROR, "Server Error").into_response(),
             }
         }
-        Err(_) => (StatusCode::NOT_FOUND, "404 Not Found").into_response(),
+        Err(_) => handler_404().await,
     }
 }
 

src/pg_store.rs

@@ -156,7 +156,7 @@ impl Store {
     // Takes a question id and a list of tags, and remove any existing question_tag join associations
     // Ignores if an association does not already exist
     // Returns Ok(true) on success
-    pub async fn _unassociate_tags(
+    pub async fn unassociate_tags(
         &mut self,
         question_id: u8,
         tags: Vec<Tag>,
@@ -330,9 +330,14 @@ impl Store {
     }
 
     //Update a question entity - just the question details (not tags)
-    pub async fn _update_question(&mut self, question: Question) -> Result<Question, String> {
+    pub async fn update_question(
+        &mut self,
+        id: u8,
+        title: String,
+        content: String,
+    ) -> Result<Question, String> {
         let result = sqlx::query("UPDATE questions SET title = $1 AND SET content = $2 WHERE id = $3 RETURNING id, title, content")
-        .bind(question.title).bind(question.content).bind(question.id.to_string())
+        .bind(title).bind(content).bind(id.to_string())
         .fetch_one(&self.connection).await;
         match result {
             Ok(pg_row) => Ok(Question::new(