add route for a specific blog post

database.go

@@ -2,6 +2,7 @@ package main
 
 import (
   "database/sql"
+  "strconv"
   _ "github.com/lib/pq"
 )
 
@@ -30,7 +31,22 @@ func db_open(url string) error {
 func GetPosts() DBPosts {
   rows, err := DB.Query("select title from posts order by written desc")
   if err != nil { return make(DBPosts, 0) }
+  defer rows.Close()
 
+  return convertRowsToPosts(rows)
+}
+
+func GetPostsWithID(id_raw string) DBPosts {
+  id, err := strconv.Atoi(id_raw)
+  if err != nil { return make(DBPosts, 0) }
+
+  rows, err := DB.Query("select title from posts where id = $1", id)
+  if err != nil { return make(DBPosts, 0) }
+  defer rows.Close()
+  return convertRowsToPosts(rows)
+}
+
+func convertRowsToPosts(rows *sql.Rows) DBPosts {
   result := make(DBPosts, 0)
   for rows.Next() {
     post := Post{}
@@ -39,4 +55,3 @@ func GetPosts() DBPosts {
   }
   return result
 }
-

routes.go

@@ -1,19 +1,20 @@
 package main
 
 import (
+  "fmt"
   "net/http"
   "github.com/julienschmidt/httprouter"
 )
 
 // map URLs to their functions
-func define_routes(router *httprouter.Router) {
-  router.HandlerFunc("GET", "/", RouteIndex)
-
+func Routes(router *httprouter.Router) {
+  router.GET("/", RouteIndex)
   router.GET("/post", RoutePosts)
+  router.GET("/post/:id", RoutePostsWithID)
 }
 
 // the function for route /
-func RouteIndex(w http.ResponseWriter, r *http.Request) {
+func RouteIndex(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
   Templates.ExecuteTemplate(w, "welcome", nil)
 }
 
@@ -21,3 +22,12 @@ func RoutePosts(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
   posts := GetPosts()
   Templates.ExecuteTemplate(w, "posts/index", posts)
 }
+
+func RoutePostsWithID(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+  posts := GetPostsWithID(ps.ByName("id"))
+  Templates.ExecuteTemplate(w, "posts/index", posts)
+}
+
+func NoOp(w http.ResponseWriter, _ *http.Request, _ httprouter.Params) {
+  fmt.Fprintf(w, "Not implemented yet!")
+}