here come the tags

app/models/clip.rb

@@ -1,5 +1,7 @@
 class Clip < ApplicationRecord
   has_one_attached :video
   belongs_to :category
+  has_many :tag_to_clips
+  has_many :tags, through: :tag_to_clips
   validates :title, presence: true
 end

app/models/tag.rb

@@ -0,0 +1,4 @@
+class Tag < ApplicationRecord
+  has_many :tag_to_clips
+  has_many :clips, through: :tag_to_clips
+end

app/models/tag_to_clip.rb

@@ -0,0 +1,4 @@
+class TagToClip < ApplicationRecord
+  belongs_to :clip
+  belongs_to :tag
+end