Hi! I'm just starting out with Rust so this is all very new to me so I wanted to say thanks for creating this example repo, it's been helpful 😄

I am hitting an error when running bash bin/setup though - have you seen or know about this error?

Compiling rocket_http v0.4.5
error: proc macro panicked
   --> /home/onx2/.cargo/registry/src/github.com-1ecc6299db9ec823/rocket_http-0.4.5/src/parse/uri/parser.rs:119:34
    |
119 |             let path_and_query = pear_try!(path_and_query(is_pchar));
    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: message: called `Option::unwrap()` on a `None` value
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

error: could not compile `rocket_http`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
^C  Building [====================================================>  ] 195/201: diesel 

As an aside, I had to change the database url in the setup script to include the user and password, so something like this:

echo DATABASE_URL=postgres://username:password@localhost/graphql-app-example >> .env

Dependabot can't resolve your Rust dependency files.

As a result, Dependabot couldn't update your dependencies.

The error Dependabot encountered was:

info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'
info: latest update on 2019-07-22, rust version 1.38.0-nightly (273f42b59 2019-07-21)
info: downloading component 'rustc'
info: downloading component 'rust-std'
info: downloading component 'cargo'
info: downloading component 'rust-docs'
info: installing component 'rustc'
info: installing component 'rust-std'
info: installing component 'cargo'
info: installing component 'rust-docs'
error: failed to parse lock file at: /home/dependabot/dependabot-updater/dependabot_tmp_dir/Cargo.lock

Caused by:
  package `juniper` is specified twice in the lockfile

If you think the above is an error on Dependabot's side please don't hesitate to get in touch - we'll do whatever we can to fix it.

You can mention @dependabot in the comments below to contact the Dependabot team.

I already have a recent Rocket application that uses the rocket_contrib::database module.
This seemed to me, as a beginner, the easier way to integrate a database using the Diesel driver.
However, I cannot seem to make it work if I try to adapt this example for it?

Given I have:

#[database("foo_db")]
pub struct DbConn(diesel::SqliteConnection);

I tried to put a DbConn in Context, but that doesn't seem to be possible; DbConn does not implement Sync? I also tried to use DbConn as Context, given that FromRequest is implemented but then I really get pages of warnings that I will not repeat here.

Would you consider adapting the example to use rocket_contrib::databases instead of a custom DB pooling implementation?

How would an interface be implemented in this example?

I'm thinking of something like in the official example to both list all the Characters or only Humans or Droids.

How would juniper-from-schema and juniper-eager-loading be used together with Diesel to avoid N+1 queries in these lists?