From bb225b12ee504f069099bf6b3b9113d82c387e4b Mon Sep 17 00:00:00 2001
From: Billy Chan <ccw.billy.123@gmail.com>
Date: Mon, 20 Sep 2021 16:06:17 +0800
Subject: [PATCH] Rocket example page number starts from one

---
 examples/rocket_example/src/main.rs               | 7 +++++--
 examples/rocket_example/templates/index.html.tera | 4 ++--
 src/executor/paginator.rs                         | 2 +-
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/examples/rocket_example/src/main.rs b/examples/rocket_example/src/main.rs
index c1df1ee1..e73df30f 100644
--- a/examples/rocket_example/src/main.rs
+++ b/examples/rocket_example/src/main.rs
@@ -80,8 +80,11 @@ async fn list(
     flash: Option<FlashMessage<'_>>,
 ) -> Template {
     // Set page number and items per page
-    let page = page.unwrap_or(0);
+    let page = page.unwrap_or(1);
     let posts_per_page = posts_per_page.unwrap_or(DEFAULT_POSTS_PER_PAGE);
+    if page == 0 {
+        panic!("Page number cannot be zero");
+    }
 
     // Setup paginator
     let paginator = Post::find()
@@ -90,7 +93,7 @@ async fn list(
 
     // Fetch paginated posts
     let posts = paginator
-        .fetch_page(page)
+        .fetch_page(page - 1)
         .await
         .expect("could not retrieve posts");
 
diff --git a/examples/rocket_example/templates/index.html.tera b/examples/rocket_example/templates/index.html.tera
index 0cba1b7d..e755e1f7 100644
--- a/examples/rocket_example/templates/index.html.tera
+++ b/examples/rocket_example/templates/index.html.tera
@@ -26,9 +26,9 @@
     <tr>
       <td></td>
       <td>
-        {% if page == 0 %} Previous {% else %}
+        {% if page == 1 %} Previous {% else %}
         <a href="/?page={{ page - 1 }}&posts_per_page={{ posts_per_page }}">Previous</a>
-        {% endif %} | {% if page == num_pages - 1 %} Next {% else %}
+        {% endif %} | {% if page == num_pages %} Next {% else %}
         <a href="/?page={{ page + 1 }}&posts_per_page={{ posts_per_page }}">Next</a>
         {% endif %}
       </td>
diff --git a/src/executor/paginator.rs b/src/executor/paginator.rs
index 0cc7acbc..24822111 100644
--- a/src/executor/paginator.rs
+++ b/src/executor/paginator.rs
@@ -24,7 +24,7 @@ impl<'db, S> Paginator<'db, S>
 where
     S: SelectorTrait + 'db,
 {
-    /// Fetch a specific page
+    /// Fetch a specific page; page index starts from zero
     pub async fn fetch_page(&self, page: usize) -> Result<Vec<S::Item>, DbErr> {
         let query = self
             .query