Convert from in memory to a real database

Had a bunch of issues following the text
- corresponding_question vs question_id in a bunch of queries
- not RETURNING id, content, corresponding_question" from insert
- comile errors between rust 1.73 and sqlx 0.7.4
  ```
  error[E0658]: `async fn` return type cannot contain a projection
      or `Self` that references lifetimes from a parent scope error:

  could not compile `sqlx-core`
  ```
    - launchbadge/sqlx#2855 (comment)
    - updated with
      ```sh
      rustc --version
      rustc 1.73
      rustup update
      rustc --version
      rustc 1.78.0
      cargo --version
      cargo 1.78.0
      ```
- but got there in the end
- try:
    just
    just clean
    just setup-db
    cargo run
    just demo-crud

Author: saramic

lang/rust/rust_web_development/question_in_db_crud/Cargo.lock

@@ -13,3 +13,4 @@ handle-errors = { path = "handle-errors" }
 uuid = { version = "1.8.0", features = ["v4"] }
 tracing = { version = "0.1.40", features = ["log"] }
 tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
+sqlx = { version = "0.7.4", features = [ "runtime-tokio-rustls", "postgres" ] }

lang/rust/rust_web_development/question_in_db_crud/Cargo.toml

@@ -7,3 +7,5 @@ edition = "2021"
 
 [dependencies]
 warp = "0.3.7"
+tracing = { version = "0.1.40", features = ["log"] }
+sqlx = { version = "0.7.4" }

lang/rust/rust_web_development/question_in_db_crud/handle-errors/Cargo.lock

@@ -4,6 +4,8 @@ use warp::{
     reject::Reject,
     Rejection, Reply,
 };
+use tracing::{instrument};
+use sqlx::error::Error as SqlxError;
 
 #[derive(Debug)]
 pub enum Error {
@@ -12,26 +14,28 @@ pub enum Error {
     WrongIndex,
     QuestionNotFound,
     AnswerNotFound,
+    DatabaseQueryError(SqlxError),
 }
 
 impl std::fmt::Display for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        match *self {
+        match &*self {
             Error::ParseError(ref err) => {
                 write!(f, "Cannot parse parameter: {}", err)
             }
             Error::MissingParameters => write!(f, "Missing parameter"),
             Error::WrongIndex => write!(f, "Wrong index, start needs to be less than end"),
             Error::QuestionNotFound => write!(f, "Question not found"),
             Error::AnswerNotFound => write!(f, "Answer not found"),
+            Error::DatabaseQueryError(e) => write!(f, "Error querying the database {}", e),
         }
     }
 }
 
 impl Reject for Error {}
 
+#[instrument]
 pub async fn return_error(r: Rejection) -> Result<impl Reply, Rejection> {
-    // println!("{:?}", r);
     if let Some(error) = r.find::<Error>() {
         Ok(warp::reply::with_status(
             error.to_string(),

lang/rust/rust_web_development/question_in_db_crud/handle-errors/Cargo.toml

@@ -0,0 +1,93 @@
+set shell := ["zsh", "-uc"]
+
+# Colors
+RED     := "\\u001b[31m"
+GREEN   := "\\u001b[32m"
+YELLOW  := "\\u001b[33m"
+BLUE    := "\\u001b[34m"
+MAGENTA := "\\u001b[35m"
+BOLD    := "\\u001b[1m"
+RESET   := "\\u001b[0m"
+
+_default:
+    @just --list --unsorted
+
+# setup the rustwedev database
+@setup-db:
+    psql rustwebdev -XtAc "\q" > /dev/null 2>&1 || \
+        psql -c "create database rustwebdev;" && \
+        echo "rustwebdev created"
+
+    psql rustwebdev -c " \
+    CREATE TABLE IF NOT EXISTS questions ( \
+        id serial PRIMARY KEY, \
+        title VARCHAR (255) NOT NULL, \
+        content TEXT NOT NULL, \
+        tags TEXT [], \
+        created_on TIMESTAMP NOT NULL DEFAULT NOW() \
+    );"
+    psql rustwebdev -c " \
+    CREATE TABLE IF NOT EXISTS answers ( \
+        id serial PRIMARY KEY, \
+        content TEXT NOT NULL, \
+        created_on TIMESTAMP NOT NULL DEFAULT NOW(), \
+        corresponding_question integer REFERENCES questions \
+    );"
+    psql rustwebdev -c "\dt"
+
+QID := "1"
+# demo CRUD
+demo-crud:
+    @echo "{{YELLOW}}attempting to use id: {{QID}} but should get this from create{{RESET}}"
+
+    @echo "{{GREEN}}🄻 ist{{RESET}}"
+    curl localhost:1337/questions
+    @echo
+
+    @echo "{{GREEN}}🄲 reate{{RESET}}"
+    curl localhost:1337/questions \
+        -H "Content-Type: application/json" \
+        -d '{"id":"{{QID}}","title":"the title","content":"the content"}'
+    @echo
+    @echo "{{RED}}above create should return the :id{{RESET}}"
+
+    @echo "{{GREEN}}\n🅁 ead{{RESET}}"
+    curl "localhost:1337/question/{{QID}}"
+
+    @echo "{{GREEN}}\n🅄 pdate{{RESET}}"
+    curl -X PUT \
+        "localhost:1337/questions/{{QID}}" \
+        -H 'content-type: application/json' \
+        -d '{"id":"'QID'","title":"NOT","content":"NOT"}'
+
+    # check again
+    curl "localhost:1337/question/{{QID}}"
+
+    @echo "\n{{GREEN}}🅰 🅳 🅳 {{YELLOW}}𝓐𝓷𝓼𝔀𝓮𝓻{{RESET}}"
+    curl localhost:1337/answers \
+        -H "Content-Type: application/json" \
+        -d '{"id":1,"content":"also via json","question_id":"{{QID}}"}'
+    @echo
+    @echo "{{RED}}above fails as only form encoding is supported{{RESET}}"
+
+    @echo "\n{{GREEN}}🅰 🅳 🅳 {{YELLOW}}𝓐𝓷𝓼𝔀𝓮𝓻{{RESET}}"
+    curl localhost:1337/answers \
+        -H "Content-Type: application/x-www-form-urlencoded" \
+        --data-urlencode "id=1" \
+        --data-urlencode "content=also from a form" \
+        --data-urlencode "question_id={{QID}}"
+
+    @echo "\n{{GREEN}}🅶 🅴 🆃 {{YELLOW}}𝓐𝓷𝓼𝔀𝓮𝓻𝓼{{RESET}}"
+    curl "localhost:1337/questions/{{QID}}/answers"
+
+    @echo "{{GREEN}}\n🄳 elete{{RESET}}"
+    curl -X DELETE "localhost:1337/questions/{{QID}}"
+
+    @echo "{{GREEN}}\n🄻 ist{{RESET}}"
+    curl localhost:1337/questions
+
+# cleanup and remove rustwebdev database
+@clean:
+    psql rustwebdev -c '\q' > /dev/null 2>&1 && \
+        psql -c "drop database rustwebdev;" || \
+        echo "rustwebdev alrady dropped"