Cargo.lock

@@ -360,6 +360,7 @@ dependencies = [
  "askama_web",
  "axum",
  "camino",
+ "csv",
  "dirs",
  "log",
  "pretty_env_logger",
@@ -607,6 +608,27 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "csv"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52cd9d68cf7efc6ddfaaee42e7288d3a99d613d4b50f76ce9827ae0c6e14f938"
+dependencies = [
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde_core",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "704a3c26996a80471189265814dbc2c257598b96b8a7feae2d31ace646bb9782"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "darling"
 version = "0.20.11"

Cargo.toml

@@ -31,3 +31,4 @@ pretty_env_logger = "0.5.0"
 # custom logger
 log = "0.4.29"
 serde_with = "3.16.1"
+csv = "1.4.0"

src/lib.rs

@@ -18,12 +18,13 @@ pub fn build_app(state: AppState) -> Router {
 
     Router::new()
         .route("/", get(routes::book::index))
+        .route("/books/new", get(routes::book::new))
         .route("/books", post(routes::book::create))
         .route("/books/{id}", get(routes::book::show))
         .route("/books/{id}", post(routes::book::update))
         .route("/books/{id}/delete", post(routes::book::delete))
         .route("/books/{id}/edit", get(routes::book::edit))
-        .route("/books/new", get(routes::book::new))
+        .route("/books/download_csv", get(routes::book::download_csv))
         .route("/users", get(routes::user::index))
         .route("/users/new", get(routes::user::new))
         .route("/users/{id}/edit", get(routes::user::edit))

src/models/book.rs

@@ -78,7 +78,18 @@ impl BookOperator {
             .context(DBSnafu)
     }
 
-    pub async fn list_paginate(
+    pub async fn all_filtered(&self, query: Option<IndexQuery>) -> Result<Vec<Model>, BookError> {
+        let conditions = Self::filter_conditions(query);
+
+        Entity::find()
+            .filter(conditions)
+            .order_by_desc(Column::Id)
+            .all(&self.state.db)
+            .await
+            .context(DBSnafu)
+    }
+
+    pub async fn all_paginate(
         &self,
         page: u64,
         query: Option<IndexQuery>,
@@ -86,24 +97,7 @@ impl BookOperator {
         let page = if page > 0 { page } else { 1 }; // keep 1-indexed
         let page_0indexed = page - 1; // convert for SeaORM (0-based index)
 
-        let mut conditions = Condition::all();
-        if let Some(book_query) = query {
-            if let Some(title) = book_query.title {
-                conditions = conditions.add(Column::Title.contains(&title));
-            }
-
-            if let Some(authors) = book_query.authors {
-                conditions = conditions.add(Column::Authors.contains(&authors));
-            }
-
-            if let Some(owner_id) = book_query.owner_id {
-                conditions = conditions.add(Column::OwnerId.eq(owner_id));
-            }
-
-            if let Some(current_holder_id) = book_query.current_holder_id {
-                conditions = conditions.add(Column::CurrentHolderId.eq(current_holder_id));
-            }
-        }
+        let conditions = Self::filter_conditions(query);
 
         let book_pages = Entity::find()
             .filter(conditions)
@@ -209,4 +203,28 @@ impl BookOperator {
 
         book.delete(&self.state.db).await.context(DBSnafu)
     }
+
+    // private
+
+    fn filter_conditions(query: Option<IndexQuery>) -> Condition {
+        let mut conditions = Condition::all();
+        if let Some(book_query) = query {
+            if let Some(title) = book_query.title {
+                conditions = conditions.add(Column::Title.contains(&title));
+            }
+
+            if let Some(authors) = book_query.authors {
+                conditions = conditions.add(Column::Authors.contains(&authors));
+            }
+
+            if let Some(owner_id) = book_query.owner_id {
+                conditions = conditions.add(Column::OwnerId.eq(owner_id));
+            }
+
+            if let Some(current_holder_id) = book_query.current_holder_id {
+                conditions = conditions.add(Column::CurrentHolderId.eq(current_holder_id));
+            }
+        }
+        return conditions;
+    }
 }

src/routes/book.rs

@@ -4,15 +4,17 @@ use askama::Template;
 use askama_web::WebTemplate;
 use axum::{
     Form,
+    body::Body,
     extract::{Path, Query, State},
-    response::{IntoResponse, Redirect},
+    response::{IntoResponse, Redirect, Response},
 };
+use csv::Writer;
 use serde::Deserialize;
 use serde_with::{NoneAsEmptyString, serde_as};
 use snafu::prelude::*;
 
-use crate::models::book::Model as BookModel;
-use crate::models::user::Model as UserModel;
+use crate::{models::book::Model as BookModel, state::error::CSVSnafu};
+use crate::{models::user::Model as UserModel, state::error::IOSnafu};
 
 use crate::{
     models::{book::BookOperator, user::UserOperator},
@@ -72,7 +74,7 @@ pub async fn index(
 
     // Get all Book filtered with query
     let books_paginate = BookOperator::new(state)
-        .list_paginate(page, Some(query.clone()))
+        .all_paginate(page, Some(query.clone()))
         .await
         .context(BookSnafu)?;
 
@@ -254,3 +256,75 @@ pub async fn delete(
 
     Ok(Redirect::to("/").into_response())
 }
+
+/// Download CSV filter (no paginate) of all books
+pub async fn download_csv(
+    State(state): State<AppState>,
+    Query(query): Query<IndexQuery>,
+) -> Result<impl axum::response::IntoResponse, AppStateError> {
+    let books = BookOperator::new(state.clone())
+        .all_filtered(Some(query))
+        .await
+        .context(BookSnafu)?;
+
+    let users = UserOperator::new(state).all().await.context(UserSnafu)?;
+
+    let users_by_id: HashMap<i32, UserModel> = users.into_iter().map(|u| (u.id, u)).collect();
+
+    let mut wtr = Writer::from_writer(vec![]);
+    wtr.write_record(&[
+        "id",
+        "Title",
+        "Author(s)",
+        "description",
+        "owner_id",
+        "current_holder_id",
+        "comment",
+    ])
+    .context(CSVSnafu)?;
+
+    for book in books {
+        let owner_format = match users_by_id.get(&book.owner_id).cloned().ok_or(UserSnafu) {
+            Ok(owner) => format!("{} (id: {})", owner.name.to_string(), owner.id),
+            Err(_) => "-".to_string(),
+        };
+
+        let current_holder = match users_by_id
+            // if current_holder_id is None, take 0.
+            // So get returns errors because user with id 0 can't exist
+            .get(&book.current_holder_id.unwrap_or(0))
+            .cloned()
+            .ok_or(UserSnafu)
+        {
+            Ok(current_holder) => format!(
+                "{} (id: {})",
+                current_holder.name.to_string(),
+                current_holder.id
+            ),
+            Err(_) => "-".to_string(),
+        };
+
+        wtr.write_record(&[
+            book.id.to_string(),
+            book.title,
+            book.authors,
+            book.description.unwrap_or_default(),
+            owner_format,
+            current_holder,
+            book.comment.unwrap_or_default(),
+        ])
+        .context(CSVSnafu)?;
+    }
+
+    wtr.flush().context(IOSnafu)?;
+
+    let csv_bytes = wtr.into_inner();
+
+    match csv_bytes {
+        Ok(csv_bytes) => Ok(Response::builder()
+            .header("Content-Type", "text/csv")
+            .body(Body::from(csv_bytes))
+            .unwrap()),
+        Err(_) => Ok(Redirect::to("/").into_response()),
+    }
+}

src/state/error.rs

@@ -33,6 +33,14 @@ pub enum AppStateError {
     Book {
         source: BookError,
     },
+    #[snafu(display("CSV Error"))]
+    CSV {
+        source: csv::Error,
+    },
+    #[snafu(display("IO Error"))]
+    IO {
+        source: std::io::Error,
+    },
 }
 
 #[derive(Template, WebTemplate)]

templates/index.html

@@ -4,7 +4,11 @@
 {% import "components/cards.html" as cards %}
 
 {% block main %}
-  {{ typography::heading("All books") }}
+  {% call typography::heading("All books") %}
+    <a href="/books/download_csv?{{ base_query }}" class="btn btn-info">
+      <i class="fa fa-download me-2" aria-hidden="true"></i> Download (csv)
+    </a>
+  {% endcall %}
 
   {% call cards::card() %}
     <form method="get">

templates/layout/header.html

@@ -25,10 +25,9 @@
         </select>
 
         <a class="btn btn-success text-white" href="/books/new">
-          <i class="fa fa-download me-2"></i>
           Add&nbsp;book
         </a>
       </div>
     </div>
   </div>
-</nav>
+</nav>