add paginator sample

.env

@@ -1 +1,4 @@
-DATABASE_URL=sqlite://database.db
+DATABASE_URL=sqlite://database.db
+OAUTH2_CLIENT_SECRET=
+OAUTH2_CLIENT_ID=
+OAUTH2_SERVER=

.gitignore

@@ -13,3 +13,6 @@ Cargo.lock
 # Added by cargo
 
 /target
+database.db
+database.*
+database.db-wal

Cargo.toml

@@ -23,5 +23,5 @@ serde = "1.0.130"
 serde_json = "1.0.71"
 serde_derive = "1.0.130"
 
-sea-orm = { version = "^0", features = [ "sqlx-sqlite", "runtime-actix-native-tls", "macros" ], default-features = false }
+sea-orm = { version = "0.5.0", features = [ "sqlx-sqlite", "runtime-actix-native-tls", "macros" ], default-features = false }
 

src/actix_admin/mod.rs

@@ -1,22 +1,65 @@
-use actix_web::{web, guard, HttpRequest, HttpResponse};
+use actix_web::{web, guard, HttpRequest, HttpResponse, Error, error};
+use tera::{ Tera, Context};
+
+use crate::entity::Post;
+use crate::entity::post;
+
+use sea_orm::{ entity::*, query::*, SelectorTrait, ModelTrait, ConnectionTrait, ColumnTrait, PaginatorTrait, EntityTrait };
+use sea_orm::{{ DatabaseConnection, ConnectOptions }};
+
+const DEFAULT_POSTS_PER_PAGE: usize = 5;
+
+#[derive(Debug, Deserialize)]
+pub struct Params {
+    page: Option<usize>,
+    posts_per_page: Option<usize>,
+}
 
 async fn index(data: web::Data<super::AppState>) -> &'static str {
     "Welcome!"
 }
 
-async fn list(data: web::Data<super::AppState>) -> &'static str {
-    "List!"
+async fn list<T: EntityTrait>(
+    req: HttpRequest,
+    data: web::Data<super::AppState>) -> Result<HttpResponse, Error> 
+    {
+    let db = &data.db;
+    let params = web::Query::<Params>::from_query(req.query_string()).unwrap();
+
+    let page = params.page.unwrap_or(1);
+    let posts_per_page = params.posts_per_page.unwrap_or(DEFAULT_POSTS_PER_PAGE);
+    let paginator = Post::find()
+        .order_by_asc(post::Column::Id)
+        .paginate(db, posts_per_page);
+    let num_pages = paginator.num_pages().await.ok().unwrap();
+
+    let posts = paginator
+        .fetch_page(page - 1)
+        .await
+        .expect("could not retrieve posts");
+    
+    let mut ctx = Context::new();
+    ctx.insert("posts", &posts);
+    ctx.insert("page", &page);
+    ctx.insert("posts_per_page", &posts_per_page);
+    ctx.insert("num_pages", &num_pages);
+
+    let body = data.tmpl
+        .render("list.html", &ctx)
+        .map_err(|_| error::ErrorInternalServerError("Template error"))?;
+    Ok(HttpResponse::Ok().content_type("text/html").body(body))
 }
 
-fn entity_scope() -> actix_web::Scope {
-    let scope = web::scope("/entity")
-    .route("/list", web::get().to(list));
+fn entity_scope<T: EntityTrait>(entity: T) -> actix_web::Scope {
+    let entity_name = entity.table_name();
+    let scope = web::scope(&format!("/{}",entity_name))
+        .route("/list", web::get().to(list::<T>));
     scope
 }
 
 pub fn admin_scope() -> actix_web::Scope {
     let scope = web::scope("/admin")
         .route("/", web::get().to(index))
-        .service(entity_scope());
+        .service(entity_scope(Post));
     scope
 }

src/entity/mod.rs

@@ -2,7 +2,7 @@
 use sea_orm::sea_query::{ColumnDef, TableCreateStatement};
 use sea_orm::{error::*, sea_query, ConnectionTrait, DbConn, ExecResult};
 
-mod post;
+pub mod post;
 pub use post::Entity as Post;
 
 // setup

src/entity/post.rs

@@ -2,7 +2,7 @@ use sea_orm::entity::prelude::*;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone, Debug, PartialEq, DeriveEntityModel, Deserialize, Serialize)]
-#[sea_orm(table_name = "posts")]
+#[sea_orm(table_name = "post")]
 pub struct Model {
     #[sea_orm(primary_key)]
     #[serde(skip_deserializing)]

src/main.rs

@@ -74,7 +74,6 @@ async fn main() {
         concat!(env!("CARGO_MANIFEST_DIR"), "/templates/**/*")
     ).unwrap();
 
-    dotenv::dotenv().ok();
     let db_url = env::var("DATABASE_URL").expect("DATABASE_URL is not set in .env file");
     let mut opt = ConnectOptions::new(db_url);
     opt.max_connections(100)

templates/list.html

@@ -0,0 +1,8 @@
+{% extends "base.html" %}
+
+{% block content %}
+<p>posts: {{ posts }}</p>
+<p>page: {{ page }}</p>
+<p>posts_per_page: {{ posts_per_page }}</p>
+<p>num_pages: {{ num_pages }}</p>
+{% endblock content %}