issue with Liquid module_data loop with if statement

i having issue getting below if statement function inside loop. works fine when outside loop on single post, not seem take assign when inside.

 

{module_data resource="blogposts" version="v3" fields="id,posttitle,postfeaturedimage,postbody,releasedate" template="" order="-id" limit="5" skip="3" collection="blogposts"}

 

 

{% item in blogposts.items%}

  

  {% if item.postfeaturedimage == "" %}

       

  {% assign item.postfeaturedimage = "/_assets/img/default_blog_picture.jpg" -%}

       

  {% endif %}

   

    <div class="row">

  <div class="large-4 columns">

  <p><a href="{{ item.posturl }}" title="read more"><img src="{{ item.postfeaturedimage }}?action=thumbnail&width=1200&height=600&algorithm=fill_proportional" alt="{{ item.posttitle }}"/></a></p>

  </div>

  <div class="large-8 columns">

  <h5><a href="{{ item.posturl }}" title="{{ item.posttitle }}">{{ item.posttitle | capitalize }}</a></h5>

  <p>{{ item.releasedate | date: "dddd, mmmm yyyy" }} {{ item.cat }}</p>

  <p>{{ item.postbody | truncate: 220 }}</p>

  <a href="{{ item.posturl }}" class="more">read more <i class="icon-angle-right"></i></a>

  </div>

  </div>

  <hr>

{% endfor %}

 

thanks in advance input.

do not assign same name value.

assign value new name featured image before if, assign name inside if, or if else.

{% if item.postfeaturedimage == "" -%}  

{% assign itemimage = "/_assets/img/default_blog_picture.jpg" -%}

{% else -%}

{% assign itemimage = item.postfeaturedimage -%}

{% endif -%}

 

{{itemimage}} image

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