Why is 'contains' not working with variables in product tags?

[chandra_mmbo]

{% if product.tags contains prod.title %} is not working. If I pass the static value with quote like- {% if product.tags contains '467455' %} , it is working but pass the variable, not working. Please guide.

<ul class="related-products">
{% paginate collections.all.products by 1000 %}
{% for prod in collections.all.products %}

{%- comment -%}here the issue if I use static value like='785643754', it is working but when pass the variable. it is not working {%- endcomment -%}

{% if prod.tags contains product.id %} 
<li>
<div class="image">
<a href="{{ prod.url | within: collections.all }}" title="{{ prod.title | escape }}">
{{ prod.featured_image | product_img_url: image_size | img_tag }}
</a>
</div>
<h1 class="product-title" itemprop="name">
<a href="{{ prod.url | within: collections.all }}" title="{{ prod.title | escape }}">{{ prod.title }}</a>
</h1>
<h2 class="product-price" itemprop="price">
<span id="ProductPrice">{{ prod.price | money }}</span>
{%- if prod.compare_at_price > prod.price -%}
<span id="ComparePrice">
<s class="reduced-price">{{ prod.compare_at_price | money }}</s>
</span>
{%- endif -%}
</h2>

</li>
{% capture counter %}{{ counter }}*{% endcapture %}
{% endif %}

{% endfor %}
{% endpaginate %}
</ul>

Please help that how to fix. Its urgent

**Unsolicited mentioned removed by Community Moderator**

[Kani]

Hi @chandra_mmbo 

I have read your code. And can't find '{% if product.tags contains prod.title %}'.

Most close one is '{% if prod.tags contains product.id %} ', and the problem is 'product.id', you have not define 'product', so it should be 'prod.id'

[chandra_mmbo]

Hi @Kani 

I have created a liquid file where I want to show related products by tags of current product. So I fetch all products  by  {% for prod in collections.all.products %}.

Now here, I am finding which products have current product id in tags(all products) {% if prod.tags contains product.id %}, but result not found. 

{%- comment -%}{% if prod.tags contains product.id %} current product id = 8201838624999 {%- endif -%} {%- endcomment -%}

{% if prod.tags contains '8201838624999' %}  - when replace the product.id with static value of current product, its working. 

[Kani]

Then I think you need try to print {{ product.id }}

[chandra_mmbo]

{{ product.id }}  

I print the product.id, it is displaying but in condition, not working. 

While I am using {% if prod.type contains product.id %}. It is working.  I am confuse 

 {{ prod.tags | json }} - ["8201838624999","Prints"]

[MiracleWebsoft]

I found the solution for this. Actually you are comparing a string with an integer. Both type should be the same when we use contains. Try the below code it will work

Here converted integer to string so contain work 

{% assign product_id = product.id | append: "" %}

You can use like this

{% for prod in collections.all.products %}

{% assign product_id = product.id | append: "" %}
{% if prod.tags contains product_id %}
<h1>Contain</h1>
{% else %}
<h1>Not Contain</h1>
{% endif %}

{% endfor %}