Add helper for item preview

Its API currently seems not that optimised, but in the future I want to
decrease the depdendencies on Item and ItemClass, so this is a step in
that direction.

src/frontend/item.rs

@@ -12,7 +12,9 @@ use serde::Deserialize;
 use sqlx::PgPool;
 use uuid::Uuid;
 
-use super::templates::helpers::{Colour, ItemName, PageAction, PageActionGroup, PageActionMethod};
+use super::templates::helpers::{
+    Colour, ItemName, ItemPreview, PageAction, PageActionGroup, PageActionMethod,
+};
 use super::templates::{self, datalist, forms, TemplateConfig};
 use crate::manage;
 use crate::models::*;
@@ -160,7 +162,7 @@ async fn show(
                 ul {
                     @for child in children {
                         li {
-                            a href={ "/item/" (child.id) } { (ItemName::new(child.name.as_ref(), &item_classes.get(&child.class).unwrap().name)) }
+                            (ItemPreview::from_parts(child.id, child.name.as_ref(), &item_classes.get(&child.class).unwrap().name))
                         }
                     }
                 }
@@ -172,7 +174,7 @@ async fn show(
                 ul {
                     @for item in original_packaging_of {
                         li {
-                            a href={ "/item/" (item.id) } { (ItemName::new(item.name.as_ref(), &item_classes.get(&item.class).unwrap().name)) }
+                            (ItemPreview::from_parts(item.id, item.name.as_ref(), &item_classes.get(&item.class).unwrap().name))
                         }
                     }
                 }
@@ -245,9 +247,7 @@ async fn list(pool: web::Data<PgPool>, user: Identity) -> actix_web::Result<impl
                         @let class = item_classes.get(&item.class).unwrap();
                         tr {
                             td {
-                                a href={ "/item/" (item.id) } {
+                                (ItemPreview::new(item.id, ItemName::new(item.name.as_ref(), &class.name).terse()))
-                                    (ItemName::new(item.name.as_ref(), &class.name).terse())
-                                }
                             }
                             td { a href={ "/item-class/" (class.id) } { (class.name) } }
                             td { (templates::helpers::parents_breadcrumb(&item, &class, item_parents.get(&item.id).unwrap(), &item_classes, false)) }

src/frontend/item_class.rs

@@ -11,7 +11,9 @@ use serde::Deserialize;
 use sqlx::PgPool;
 use uuid::Uuid;
 
-use super::templates::helpers::{Colour, ItemName, PageAction, PageActionGroup, PageActionMethod};
+use super::templates::helpers::{
+    Colour, ItemName, ItemPreview, PageAction, PageActionGroup, PageActionMethod,
+};
 use super::templates::{self, datalist, forms, TemplateConfig};
 use crate::manage;
 use crate::models::*;
@@ -153,7 +155,7 @@ async fn show(
                 ul {
                     @for item in items {
                         li {
-                            a href={ "/item/" (item.id) } { (ItemName::new(item.name.as_ref(), &item_class.name).terse()) }
+                            (ItemPreview::new(item.id, ItemName::new(item.name.as_ref(), &item_class.name).terse()))
                         }
                     }
                 }

src/frontend/templates/helpers.rs

@@ -133,6 +133,32 @@ impl Render for ItemName {
     }
 }
 
+pub struct ItemPreview {
+    pub id: Uuid,
+    pub name: ItemName,
+}
+
+impl ItemPreview {
+    pub fn new(id: Uuid, name: ItemName) -> Self {
+        Self { id, name }
+    }
+
+    pub fn from_parts(id: Uuid, item_name: Option<&String>, class_name: &String) -> Self {
+        Self {
+            id,
+            name: ItemName::new(item_name, class_name),
+        }
+    }
+}
+
+impl Render for ItemPreview {
+    fn render(&self) -> Markup {
+        html! {
+            a href={ "/item/" (self.id) } { (self.name) }
+        }
+    }
+}
+
 pub enum PageActionMethod {
     Get,
     Post,
@@ -236,7 +262,7 @@ pub fn parents_breadcrumb(
             };
             @for parent in parents {
                 li .breadcrumb-item {
-                    a href={ "/item/" (parent.id) } { (ItemName::new(parent.name.as_ref(), &parents_item_classes.get(&parent.class).unwrap().name)) }
+                    (ItemPreview::from_parts(parent.id, parent.name.as_ref(), &parents_item_classes.get(&parent.class).unwrap().name))
                 }
             }
             li .breadcrumb-item.active { (ItemName::new(item.name.as_ref(), &item_class.name)) }