Ensure the post categories are unique (only one). Ref: #2527 #2531

h/t @Nicholas-Perry https://github.com/jekyll/jekyll/issues/2527#issuecomment-47041756
2014-06-24 19:15:02 -04:00 · 2014-06-24 19:15:02 -04:00 · 6e104c3ed0
parent 579d9fc813
commit 6e104c3ed0
1 changed files with 3 additions and 2 deletions
--- a/lib/jekyll/post.rb
+++ b/lib/jekyll/post.rb
@ -78,8 +78,9 @@ module Jekyll

    def populate_categories
      categories_from_data = Utils.pluralized_array_from_hash(data, 'category', 'categories')
-      self.categories = (Array(categories) + categories_from_data).map {|c| c.to_s.downcase}
-      categories.flatten!
+      self.categories = (
+        Array(categories) + categories_from_data
+      ).map {|c| c.to_s.downcase}.flatten.uniq
    end

    def populate_tags