add comments on entries

app/controllers/comments_controller.rb

@@ -0,0 +1,31 @@
+class CommentsController < ApplicationController
+  before_action :require_login
+  before_action :set_commentable
+
+  def create
+    @comment = @commentable.comments.build(comment_params)
+    @comment.user = current_user
+
+    if @comment.save
+      respond_to do |format|
+        format.turbo_stream
+        format.html { redirect_to @commentable }
+      end
+    else
+      # Handle validation errors
+      redirect_to @commentable, alert: "Comment could not be created: #{@comment.errors.full_messages.to_sentence}"
+    end
+  end
+
+  private
+
+  def set_commentable
+    if params[:entry_id]
+      @commentable = Entry.find(params[:entry_id])
+    end
+  end
+
+  def comment_params
+    params.require(:comment).permit(:body, :language_code)
+  end
+end