Chrono DateTime<UTC> trait exception

[arnau]

Hello, today I started migrating from diesel 0.9 on Rust 1.15 nightly to diesel 0.10 on Rust 1.15 stable. Right now I'm trying to understand what is wrong with my usage of chrono's DateTime<UTC>. I tried to replicate the error modifying the getting started example. The error below corresponds to this: arnau@bbdaad8

In short:

• Added chrono 0.3.
• Enabled feature "chrono".
• Added a new column created_at TIMESTAMP WITH TIME ZONE.
• Add the created_at field to the Post model.

The error:

$ cargo build
warning: unused manifest key: package.categories
   Compiling chrono_example v0.1.0 (file:///Users/arnau/kitchen/other/diesel/examples/chrono_example)
error[E0277]: the trait bound `chrono::DateTime<chrono::UTC>: diesel::types::FromSqlRow<diesel::types::Nullable<diesel::types::Timestamptz>, diesel::pg::Pg>` is not satisfied
  --> src/lib.rs:34:10
   |
34 |         .get_result(conn)
   |          ^^^^^^^^^^ the trait `diesel::types::FromSqlRow<diesel::types::Nullable<diesel::types::Timestamptz>, diesel::pg::Pg>` is not implemented for `chrono::DateTime<chrono::UTC>`
   |
   = help: the following implementations were found:
   = help:   <chrono::DateTime<chrono::UTC> as diesel::types::FromSqlRow<diesel::types::Timestamptz, DB>>
   = note: required because of the requirements on the impl of `diesel::types::FromSqlRow<(diesel::types::Integer, diesel::types::Text, diesel::types::Text, diesel::types::Bool, diesel::types::Nullable<diesel::types::Timestamptz>), diesel::pg::Pg>` for `(i32, std::string::String, std::string::String, bool, chrono::DateTime<chrono::UTC>)`
   = note: required because of the requirements on the impl of `diesel::Queryable<(diesel::types::Integer, diesel::types::Text, diesel::types::Text, diesel::types::Bool, diesel::types::Nullable<diesel::types::Timestamptz>), diesel::pg::Pg>` for `models::Post`

Any ideas why this is happening?

Thanks!

---

Rust version: rustc 1.15.1 (021bd294c 2017-02-08)
OS: macOS 10.12.3 (Sierra)

[Eijebong]

Yeah, you should use the master branch of diesel, use chrono 0.2 or wait for 0.11.

Since the migration to chrono 0.3 was a breaking change, it wasn't released in 0.10.x

See #648

[arnau]

Ah! Thanks!