ch4.7

cmd/web/handlers.go

@@ -1,10 +1,13 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"html/template"
 	"net/http"
 	"strconv"
+
+	"gitea.local.lab/Lbenedar/snippetbox/internal/models"
 )
 
 func (app *application) home(w http.ResponseWriter, r *http.Request) {
@@ -34,7 +37,17 @@ func (app *application) snippetView(w http.ResponseWriter, r *http.Request) {
 		app.notFound(w)
 		return
 	}
-	fmt.Fprintf(w, "Display a specific snippet with ID %d...", id)
+
+	snippet, err := app.snippets.Get(id)
+	if err != nil {
+		if errors.Is(err, models.ErrNoRecord) {
+			app.notFound(w)
+		} else {
+			app.serverError(w, err)
+		}
+		return
+	}
+	fmt.Fprintf(w, "%+v", snippet)
 }
 
 func (app *application) snippetCreate(w http.ResponseWriter, r *http.Request) {

internal/models/errors.go

@@ -0,0 +1,5 @@
+package models
+
+import "errors"
+
+var ErrNoRecord = errors.New("models: no matching record found")

internal/models/snippets.go

@@ -2,6 +2,7 @@ package models
 
 import (
 	"database/sql"
+	"errors"
 	"time"
 )
 
@@ -33,7 +34,19 @@ func (m *SnippetModel) Insert(title string, content string, expires int) (int, e
 }
 
 func (m *SnippetModel) Get(id int) (*Snippet, error) {
-	return nil, nil
+	s := &Snippet{}
+	stmt := `SELECT id, title, content, created, expires FROM snippets
+	WHERE expires > UTC_TIMESTAMP() AND id = ?`
+
+	err := m.DB.QueryRow(stmt, id).Scan(&s.ID, &s.Title, &s.Content, &s.Created, &s.Expires)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, ErrNoRecord
+		} else {
+			return nil, err
+		}
+	}
+	return s, nil
 }
 
 func (m *SnippetModel) Latest() ([]*Snippet, error) {