#7 ぼちぼち

backend/app/controllers/tags_controller.rb

@@ -1,8 +1,13 @@
 class TagsController < ApplicationController
+  before_action :set_tags, only: %i[ show update destroy ]
+
   def index
+    @tags = Tag.all
+    render json: @tags
   end
 
   def show
+    render json: @tag
   end
 
   def create
@@ -13,4 +18,15 @@ class TagsController < ApplicationController
 
   def destroy
   end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_tag
+      @tag = Tag.find(params.expect(:id))
+    end
+
+    # Only allow a list of trusted parameters through.
+    def tag_params
+      params.expect(tag: [ :title, :body ])
+    end
 end