Add timestamp to gists

Cargo.lock

 dependencies = [
  "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel_derives 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pq-sys 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 name = "gist-server"
 version = "0.1.0"
 dependencies = [
+ "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "diesel 1.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "dotenv 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "r2d2 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

 edition = "2018"
 
 [dependencies]
-diesel = { version = "1.0.0", features = ["postgres"] }
+chrono = { version = "0.4.6", features = ["serde"] }
+diesel = { version = "1.0.0", features = ["postgres", "chrono"] }
 dotenv = "0.9.0"
 r2d2 = "0.8.3"
 r2d2-diesel = "1.0.0"

migrations/2019-05-01-183414_add_timestamp_to_gists/down.sql

+ALTER TABLE gists DROP COLUMN created_at;

migrations/2019-05-01-183414_add_timestamp_to_gists/up.sql

+ALTER TABLE gists ADD COLUMN created_at TIMESTAMP DEFAULT NOW();

src/gists/mod.rs

+use chrono::NaiveDateTime;
 use diesel::pg::PgConnection as PGC;
 use diesel::prelude::*;
 
 use crate::schema::gists;
 
-#[derive(Queryable, AsChangeset, Serialize, Deserialize)]
+#[derive(Queryable, Serialize, Deserialize)]
 pub struct Gist {
     pub id: i32,
     pub title: String,
     pub body: String,
+    pub created_at: Option<NaiveDateTime>,
 }
 
-#[derive(Insertable, Serialize, Deserialize)]
+#[derive(Insertable, AsChangeset, Serialize, Deserialize)]
 #[table_name = "gists"]
 pub struct InsertableGist {
     pub title: String,

src/main.rs

 #![feature(proc_macro_hygiene, decl_macro)]
 
+extern crate chrono;
 #[macro_use]
 extern crate diesel;
 extern crate dotenv;

src/schema.rs

         id -> Int4,
         title -> Varchar,
         body -> Text,
+        created_at -> Nullable<Timestamp>,
     }
 }