nickel.rs post redirect not found - rust

Question

I am using nickel.rs, PostgreSQL, and Angular.js. I can insert into my table with an HTTP POST:
// insert
{
let conn = shared_connection.clone();
router.post("/api/movies", middleware! { |request, mut response|
let conn = conn.lock().unwrap();
let stmt = match conn.prepare("insert into movie (title, releaseYear, director, genre)
values ($1, $2, $3, $4)") {
Ok(stmt) => stmt,
Err(e) => {
return response.send(format!("Preparing query failed: {}", e));
}
};
let movie = request.json_as::<MovieInsert>().unwrap();
match stmt.execute(&[
&movie.title.to_string(),
&movie.releaseYear,
&movie.director.to_string(),
&movie.genre.to_string()
]) {
Ok(v) => println!("Inserting movie was Success."),
Err(e) => println!("Inserting movie failed. => {:?}", e),
};
// ERROR (1)
// return response.set(Location("/".into()));
});
}
I know this works fine because the row is inserted in the PostgreSQL table. However, the Chrome web browser shows an error:
POST http://localhost:6767/api/movies 404 (Not Found)
I also added the code in ERROR (1) line
response.set(Location("/".into()));
however, console show the error.
expected `core::result::Result<nickel::middleware::Action<nickel::response::Response<'mw, _>, nickel::response::Response<'mw, _, hyper::net::Streaming>>, nickel::nickel_error::NickelError<'mw, _>>`,
found `&mut nickel::response::Response<'_, _>`
(expected enum `core::result::Result`,
found &-ptr)
Now it is my code applied what Shepmaster said.
// insert
{
let conn = shared_connection.clone();
router.post("/api/movies", middleware! { |request, mut response|
let conn = conn.lock().unwrap();
let stmt = match conn.prepare("insert into movie (title, releaseYear, director, genre)
values ($1, $2, $3, $4)") {
Ok(stmt) => stmt,
Err(e) => {
return response.send(format!("Preparing query failed: {}", e));
}
};
let movie = request.json_as::<MovieInsert>().unwrap();
match stmt.execute(&[
&movie.title.to_string(),
&movie.releaseYear,
&movie.director.to_string(),
&movie.genre.to_string()
]) {
Ok(v) => println!("Inserting movie was Success."),
Err(e) => println!("Inserting movie failed. => {:?}", e),
};
response.set(StatusCode::PermanentRedirect)
.set(Location("/".into()));
""
});
}
but the error occurred.
src/main.rs:155:18: 155:43 error: the trait modifier::Modifier<nickel::response::Response<'_, _>> is not implemented for the type hyper::header::common::location::Location [E0277]
src/main.rs:155 .set(Location("/".into()));
finally I fix like this!
Ok(v) => {
println!("Inserting movie was Success.");
response.set(StatusCode::Ok);
},
Err(e) => println!("Inserting movie failed. => {:?}", e),
};
//response.set(StatusCode::PermanentRedirect)
// .set(Location("/".into()));
//""
return response.send("");

Answer 1

The code, as currently listed, doesn't make any sense. There's nothing returned from your route handler:
match ... {
Ok(v) => println!("Inserting movie was Success."),
Err(e) => println!("Inserting movie failed. => {:?}", e),
};
Because nothing about the database or the frontend framework is important, your code is equivalent to this:
#[macro_use]
extern crate nickel;
use nickel::{Nickel, HttpRouter};
fn main() {
let mut server = Nickel::new();
server.post("/api/movies", middleware! { |request, mut response|
println!("Hello");
});
server.listen("127.0.0.1:6767");
}
If you return something from the handler, then the HTTP status code changes from a 404 to a 200.
If you'd like to redirect somewhere, you need to explicitly change the status code. The documentation for Response::set happens to have an example:
server.get("/a", middleware! { |_, mut res|
res.set(StatusCode::PermanentRedirect)
.set(Location("http://nickel.rs".into()));
""
});
Note that an empty string is returned, similar to before. You were trying to return the Response type directly.