Add create post endpoint and check target to the makefile

server/model/post.go

@@ -1,5 +1,9 @@
 package model
 
+import (
+	"fmt"
+)
+
 type Post struct {
 	ID        int    `json:"id"`
 	UserID    int    `json:"user_id"`
@@ -7,3 +11,23 @@ type Post struct {
 	CreatedAt int    `json:"createdat"`
 	Body      string `json:"body"`
 }
+
+func (p *Post) IsValid() error {
+	if p.UserID == 0 {
+		return fmt.Errorf("user id must not be empty")
+	}
+
+	if p.GameID == 0 {
+		return fmt.Errorf("game id must not be empty")
+	}
+
+	if p.CreatedAt == 0 {
+		return fmt.Errorf("created at must not be empty")
+	}
+
+	if p.Body == "" {
+		return fmt.Errorf("body must not be empty")
+	}
+
+	return nil
+}