//.. forms.rs
#[derive(FromForm)]
pub struct UpdatePostForm<'a> {
    pub id: i32,
    pub title: &'a str,
    pub content: &'a str,
}

// mod.rs
// Need to explicitly annotate lifetimes?
#[post("/update", data = "<form>")]
fn update(user: AuthenticatedUser, form: Form<UpdatePostForm>, conn: DbConn) -> Result<Redirect, Flash<Redirect>> {
    use super::schema::posts::dsl::*;

    let form = form.get();
    let update_post = UpdatePost {
        user_id: None,
        title: form.title,
        content: form.content,
        published: false,
    };

    diesel::update(posts.find(form.id))
        .set(&update_post)
        .get_result::<Post>(&*conn)
        .expect("Error updating Post");

    Ok(Redirect::to("/"))
}

// ERRORS
109 | / fn update(user: AuthenticatedUser, form: Form<UpdatePostForm>, conn: DbConn) -> Result<Redirect, Flash<Redirect>>{
110 | |     use super::schema::posts::dsl::*;
111 | |
112 | |     let form = form.get();
...   |
132 | |     Ok(Redirect::to("/"))
133 | | }
    | |_^
    |
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the function body at 109:1...
   --> src/posts/mod.rs:109:1
    |
109 | / fn update(user: AuthenticatedUser, form: Form<UpdatePostForm>, conn: DbConn) -> Result<Redirect, Flash<Redirect>>{
110 | |     use super::schema::posts::dsl::*;
111 | |
112 | |     let form = form.get();
...   |
132 | |     Ok(Redirect::to("/"))
133 | | }
    | |_^
note: ...so that types are compatible (expected rocket::request::FromForm<'_>, found rocket::request::FromForm<'_>)
   --> src/posts/mod.rs:109:1
    |
109 | / fn update(user: AuthenticatedUser, form: Form<UpdatePostForm>, conn: DbConn) -> Result<Redirect, Flash<Redirect>>{
110 | |     use super::schema::posts::dsl::*;
111 | |
112 | |     let form = form.get();
...   |
132 | |     Ok(Redirect::to("/"))
133 | | }
    | |_^
note: but, the lifetime must be valid for the anonymous lifetime #2 defined on the function body at 109:1...
   --> src/posts/mod.rs:109:1
    |
109 | / fn update(user: AuthenticatedUser, form: Form<UpdatePostForm>, conn: DbConn) -> Result<Redirect, Flash<Redirect>>{
110 | |     use super::schema::posts::dsl::*;
111 | |
112 | |     let form = form.get();
...   |
132 | |     Ok(Redirect::to("/"))
133 | | }
    | |_^
note: ...so that types are compatible (expected rocket::request::FromForm<'_>, found rocket::request::FromForm<'_>)
   --> src/posts/mod.rs:109:1
    |
109 | / fn update(user: AuthenticatedUser, form: Form<UpdatePostForm>, conn: DbConn) -> Result<Redirect, Flash<Redirect>>{
110 | |     use super::schema::posts::dsl::*;
111 | |
112 | |     let form = form.get();
...   |
132 | |     Ok(Redirect::to("/"))
133 | | }
    | |_^