Use pointers to make generic functions work

feed.go

@@ -37,13 +37,13 @@ func NewFeed(title string) *Feed {
 
 // AddAuthor adds the Person as an author to the Feed.
 func (f *Feed) AddAuthor(p *Person) {
-	addToSlice(f.Authors, p)
+	addToSlice(&f.Authors, p)
 	f.Updated = NewDate(time.Now())
 }
 
 // DeleteAuthor deletes the Person from the Feed. It return an error.
 func (f *Feed) DeleteAuthor(id int) error {
-	if err := deleteFromSlice(f.Authors, id); err != nil {
+	if err := deleteFromSlice(&f.Authors, id); err != nil {
 		return fmt.Errorf("error deleting author %v from entry %v: %v", id, f.ID.URI, err)
 	}
 
@@ -53,13 +53,13 @@ func (f *Feed) DeleteAuthor(id int) error {
 
 // AddCategory adds the Category to the Feed.
 func (f *Feed) AddCategory(c *Category) {
-	addToSlice(f.Categories, c)
+	addToSlice(&f.Categories, c)
 	f.Updated = NewDate(time.Now())
 }
 
 // DeleteCategory deletes the Category from the Feed. It return an error.
 func (f *Feed) DeleteCategory(id int) error {
-	if err := deleteFromSlice(f.Categories, id); err != nil {
+	if err := deleteFromSlice(&f.Categories, id); err != nil {
 		return fmt.Errorf("error deleting category %v from entry %v: %v", id, f.ID.URI, err)
 	}
 
@@ -69,13 +69,13 @@ func (f *Feed) DeleteCategory(id int) error {
 
 // AddContributor adds the Person as a contributor to the Feed.
 func (f *Feed) AddContributor(c *Person) {
-	addToSlice(f.Contributors, c)
+	addToSlice(&f.Contributors, c)
 	f.Updated = NewDate(time.Now())
 }
 
 // DeleteContributor deletes the Person from the Feed. It return an error.
 func (f *Feed) DeleteContributor(id int) error {
-	if err := deleteFromSlice(f.Contributors, id); err != nil {
+	if err := deleteFromSlice(&f.Contributors, id); err != nil {
 		return fmt.Errorf("error deleting contributor %v from entry %v: %v", id, f.ID.URI, err)
 	}
 
@@ -85,13 +85,13 @@ func (f *Feed) DeleteContributor(id int) error {
 
 // AddLink adds the Link to the Feed. There should be one Link with Rel "self".
 func (f *Feed) AddLink(l *Link) {
-	addToSlice(f.Links, l)
+	addToSlice(&f.Links, l)
 	f.Updated = NewDate(time.Now())
 }
 
 // DeleteLink deletes the Link from the Feed. It return an error.
 func (f *Feed) DeleteLink(id int) error {
-	if err := deleteFromSlice(f.Links, id); err != nil {
+	if err := deleteFromSlice(&f.Links, id); err != nil {
 		return fmt.Errorf("error deleting link %v from entry %v: %v", id, f.ID.URI, err)
 	}
 
@@ -101,13 +101,13 @@ func (f *Feed) DeleteLink(id int) error {
 
 // AddExtension adds the Extension to the Feed.
 func (f *Feed) AddExtension(e *ExtensionElement) {
-	addToSlice(f.Extensions, e)
+	addToSlice(&f.Extensions, e)
 	f.Updated = NewDate(time.Now())
 }
 
 // DeleteExtension deletes the Extension from the Feed. It return an error.
 func (f *Feed) DeleteExtension(id int) error {
-	if err := deleteFromSlice(f.Extensions, id); err != nil {
+	if err := deleteFromSlice(&f.Extensions, id); err != nil {
 		return fmt.Errorf("error deleting extension %v from entry %v: %v", id, f.ID.URI, err)
 	}
 
@@ -117,13 +117,13 @@ func (f *Feed) DeleteExtension(id int) error {
 
 // AddEntry adds the Entry to the Feed.
 func (f *Feed) AddEntry(e *Entry) {
-	addToSlice(f.Entries, e)
+	addToSlice(&f.Entries, e)
 	f.Updated = NewDate(time.Now())
 }
 
 // DeleteEntry deletes the Entry from the Feed. It return an error.
 func (f *Feed) DeleteEntry(id int) error {
-	if err := deleteFromSlice(f.Entries, id); err != nil {
+	if err := deleteFromSlice(&f.Entries, id); err != nil {
 		return fmt.Errorf("error deleting entry %v from entry %v: %v", id, f.ID.URI, err)
 	}