Creating a mixed conditional expression of Rails if statement and unless

We made adjustments for the final task. At that time, the conditional expression has a special pattern of using both if and unless. I tried to challenge. I will post it as a memorandum.

This time it is described in haml.

sample.rb

#In the view file

.item-show-page__link-btn
        -if @item.buyers.present?
          %p SOLD OUT
        -else
          - unless user_signed_in? && @item.user_id == current_user.id
            = link_to purchase_item_path(@item.id), class: "item-show-page__link" do
To purchase screen
          - else
            %p Seller cannot purchase

The contents of the method @item Contains listing information. buyers This is the method of purchase history.

Commentary

if〜else If the purchase history ID exists, SOLD OUT is displayed.

unless~else Nested inside the else of the if statementdoing. From there, the unless conditional expression is entered. If the item you listed does not match your user ID, a link to the purchase screen will appear. If not, it will appear as "Seller cannot purchase".

That is all.