Show the code where you are trying to render this form. A partial that renders 
implicitly (like in a scaffolded CRUD form):

#/app/views/posts/new.html.erb
<%= render 'form' %>

...will get a local variable named `post` in the render context. 

What does your controller look like, and what does the enclosing template look 
like that is rendering this partial?

Walter

> On Feb 8, 2018, at 6:37 PM, fugee ohu <fugee...@gmail.com> wrote:
> 
> _active_record_post_comments.html.erb
> 
> <div id="comments">
>   <%= render post.comments %>
> </div>
> <% if (user_signed_in? && current_user != User.find(post.blogger_id)) %>
>     <div>
>               <%= render partial: "blogit/comments/form", locals: { post: 
> post, comment: comment } %>
>       </div>
> <% end %>
> 
> _form.html.erb
> 
> <%= form_for [post, comment], remote: true,
>   html: {
>     class: "new_blog_comment", id: "new_blog_comment" } do |f| -%>
>  
> error:
> ActionView::Template::Error (undefined local variable or method `post' for 
> #<#<Class:0x007f606c7b4818>:0x007f607eeeb278>
> Did you mean?  @post):
>     1: 
>     2: <%= form_for [post, comment], remote: true,
>     3:   html: {
>     4:     class: "new_blog_comment", id: "new_blog_comment" } do |f| -%>
> 
> 
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