adding basic data storage

internal/model/article.go

@@ -6,15 +6,16 @@ import (
     "encoding/hex"
 )
 
-
 type Article struct {
-    SourceUrl    string
-    PublishDate  time.Time
-    FetchDate    time.Time
-    Title        string
-    Content      string
+    Identifier  uint
+    SourceUrl   string
+    PublishDate time.Time
+    FetchDate   time.Time
+    Title       string
+    Content     string
 }
 
+
 func (article *Article) Hash() string {
     /* Generates a hash based on the source url of the article. Can be used to
      * identify the article. */
@@ -22,3 +23,10 @@ func (article *Article) Hash() string {
     hash := sha256.Sum256([]byte(article.SourceUrl))
     return hex.EncodeToString(hash[:])
 }
+
+
+// --- implementation of the IIdentifiable interface ---
+
+func (article *Article) Id() uint {
+    return article.Identifier
+}