Fix bug where empty posts were allowed

There was a bug where you can submit an empty post,
but this has been fixed by setting a constraint
to check for an empty content field in the posts table.

Changes made to drumstick.sql file
 - added non_empty_column constraint to the posts table to check for
   empty posts in the content column.

Changes made to posts.go file
 - Reformatted the way errs are returned for failed posts
   in the CreatePosts func for clarity.

Author: ScriptMang

drumstick.sql

@@ -42,7 +42,8 @@ CREATE TABLE public.posts (
     user_id integer NOT NULL,
     parent_id integer NOT NULL,
     thread_id integer DEFAULT nextval('public.posts_thread_id_seq'::regclass) NOT NULL,
-    content character varying(350) NOT NULL
+    content character varying(350) NOT NULL,
+    CONSTRAINT non_empty_column CHECK ((length(TRIM(BOTH FROM content)) > 0))
 );
 
 

internal/posts/posts.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/georgysavva/scany/v2/pgxscan"
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 )
 
 type Post struct {
@@ -51,9 +52,13 @@ func CreatePosts(userPost, email string) (*Post, error) {
 		&tempPost.ThreadID, &tempPost.Content,
 	)
 
-	// check list all the errs
 	if err != nil {
-		return nil, fmt.Errorf("error: %w", err)
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) {
+			return nil, fmt.Errorf("error: %s", pgErr.Message)
+		}
 	}
+
+	// check list all the errs
 	return tempPost, nil
 }