add limit to index page, for performance improvements

cmd/frontend/Index.go

@@ -9,12 +9,10 @@ import (
 // List the latest articles using the base template.
 func (app *App) Index(w http.ResponseWriter, req *http.Request) {
 	// get articles
-    articles, err := app.articles.All()
-    if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError); return; }
-
-    // truncate
-    if len(articles) > 10 {
-        articles = articles[:10]
+	articles, err := app.articles.All(10)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
 	}
 
 	// convert to viewmodel
@@ -26,5 +24,8 @@ func (app *App) Index(w http.ResponseWriter, req *http.Request) {
 	// render template
 	t := template.Must(template.ParseFiles("assets/templates/article.html", "assets/templates/layout.html"))
 	err = t.ExecuteTemplate(w, "base", articleVMs)
-    if err != nil { http.Error(w, "Failed to render template", http.StatusInternalServerError); return; }
+	if err != nil {
+		http.Error(w, "Failed to render template", http.StatusInternalServerError)
+		return
+	}
 }

internal/model/database/articles.go

@@ -11,13 +11,14 @@ type ArticleModel struct {
 
 // Gets all the article objects from the database. This may throw an error if
 // the connection to the database fails.
-func (m *ArticleModel) All() ([]model.Article, error) {
+func (m *ArticleModel) All(limit int) ([]model.Article, error) {
 	stmt := `
         SELECT id, title, sourceUrl, author, content, publishDate, fetchDate 
         FROM articles 
         ORDER BY publishDate DESC
+		LIMIT $1
     `
-	rows, err := m.DB.Query(stmt)
+	rows, err := m.DB.Query(stmt, limit)
 	if err != nil {
 		return nil, err
 	}