Show only one product on page by specific tag in shopify

Solution:

 {% for product in collections.Daily_Deals.products %}
     {% if product.tags contains 'frontpagedeal' %}
         {% if forloop.first == true %}
            {% include 'dailydeal-countdown' %}
         {% endif %}
     {% endif %}
 {% endfor %}
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Can you please test this and tell me if this is what you want.

all i did is adding{% if forloop.first == true %} .... {% endif %} which will display only one product.

Solution:

In your second example handles are always lower case so:

<div class="row">
{% assign oneShown = false %}
      {% for product in collections.daily_deals.products %}
          {% if oneShown %}
             {% break %}
          {% endif %}
          {% if product.tags contains 'frontpagedeal' %}  
              {% include 'dailydeal-countdown' %} 
              {% assign oneShown = true %}
          {% endif %}
      {% endfor %}
</div>
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Should work. However if your collection has more than 50 products you may not find the product you are looking for so you'll need to make sure the collection has fewer than 50 products. Ideally for something like this "Daily Deals" would be a smart collection that includes products based on them being a 'frontpagedeal' and you can skip the tag check.

Solution:

Maybe it would be useful to create a "sale collection" directly in store administration and display it then.

If it is for a client, you may add an option to theme to allow client to select sale collection in theme settings.