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    <p>ContentType and GenericForeignKey comes in picture when you want to associate your model with many different models. Suppose you have store and you sell Clothes and Utensils. You have separate model for these two. You have a detail page for Cloth and a detail page for Utensil.</p> <p>You want anyone who visits the detail page of Cloth to comment on Cloth. Similarly, you want anyone who visits the detail page of Utensil to comment on this particular Utensil. So, comment can be associated to any of these, and so you need a GenericForeignKey.</p> <p>When user comments on Cloth detail page, object_id will be the id of cloth instance and content_type will be model <code>Cloth</code>. </p> <p>When user comments on Utensil detail page, object_id will be the id of utensil instance and content_type will be model <code>Utensil</code>.</p> <p>A comment can't exist by itself. It has to be related to something.</p> <p>Read <a href="https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/" rel="nofollow">https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/</a> again to get a better understanding of why ContentType and GFK exists.</p> <p>Suppose you are in Cloth detail view, so when sending the user to cloth detail page, you know the cloth id. Send this cloth id in the context as <code>object_id</code> and use it in the comment form</p> <p>So, your comment form looks like:</p> <pre><code>{% load i18n %} &lt;div class="comment"&gt; &lt;form action="{% url "comment.views.create" %}" method="post"&gt; {% csrf_token %} {% for field in form %} {{ field.label_tag }} {{ field }}&lt;p&gt; {% endfor %} &lt;input type="hidden" value="{{object_id}}" name="object_id"/&gt; &lt;input type="submit" value="{% trans "Submit" %}"&gt; &lt;/form&gt; &lt;/div&gt; </code></pre> <p>And in Comment create view, read this object id and use it. So, in view, you say:</p> <pre><code>object_id = request.POST['object_id'] </code></pre>
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    1. USAkshar Raaj
    1. USAkshar Raaj
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    1. COI understood that but I dont know how can I get post_id. Now I only use Post model. I have a post, but how can I get post_id ? Somebody must show me code example
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      1. USAmy Obrian
    2. COI appreciate your helps really. I got this error : Key 'object_id' not found in <QueryDict: {u'owner': [u'asas'], u'csrfmiddlewaretoken': [u'bAfOT1vUIr4R2mtrCsyN0GUdfcgCl4PD'], u'contentmarkdown': [u'assa'], u'email': [u'assa']}> So how can I put object_id again :((((((
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      1. USAmy Obrian
    3. COEdited, I forgot to put `name='object_id'` on the hidden input. So you should use `<input type="hidden" value="{{object_id}}" name="object_id"/>`
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      1. USAkshar Raaj
 

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