I am working on a project and I just introduced polymorphism for posting text Posts and photo Posts.
When I try to post an image I get this error: "'nil' is not an ActiveModel-compatible object that returns a valid partial path."
The first show file (app/views/dashboards/show.html.erb) with code:
<%= form_for #text_post do |form| %>
<%= form.text_field :body, placeholder: 'Post content here' %>
<%= form.submit 'Post Title!' %>
<%end%>
<%= form_for #photo_post do |form| %>
<%= form.file_field :image %>
<%= form.submit 'Post Image!' %>
<%end%>
<%= render #posts %>
which leads to this at app/views/photo_posts/_photo_post.html.erb with the following code:
<%= image_tag photo_post.image.url(:post) %>
The app/views/posts/_post.html.erb which causes problem is:
<%= div_for post do %>
<%= link_to post.user.username, post.user %>
posted
<%= render post.content %>
<%= link_to time_ago_in_words(post.created_at), post %>
<% end %>
Sorry if the details I provide is insufficient, I am a new ROR developer. If you want, you can fork or check the project from here, (I pushed so you can check for the error).
Any help/guidance is greatly appreciated!
Please try
<%= render post.content if post.content %>
instead of
<%= render post.content %>
as per the error logs, this should fix the issue.
Related
Good night.
I'm doing the getting started guide of RoR, but I have a trouble:
When I click the New Article button that redirects to the form, Rails throw an 'Encountered a syntax error while rendering template.'
The new.html.erb code is
<h1>New Article</h1>
<%= form_with scope: :article, url: articles_path, local: true do |form| %>
<%= if #article.errors.any? %>
<div id="error_explanation">
<h2>
<%= pluralize(#article.errors.count, "error") %>
prohibited this article from being saved:
</h2>
<ul>
<% #article.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<P>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= form.submit %>
</p>
<% end %>
<%= link_to 'Back', articles_path %>
The code is the same as the guide's code, so i don't know where the error or errors can be.
I also attach the error screenshot if it's any help.
Rails error message when I want tho create a new Article
Here two problems:
wrong syntax in if condition (don't need to use =)
extra \n chars in your screenshot
Change your 5 line in app/view/articles/new.html.erb to:
<% if #article.errors.any? %>
<% %> executes Ruby code
<%= %> executes Ruby code and prints out
Also read about the difference on SO
This is the picture of my problem ---> Duplicate Delete Links Picture
I have a comment with two delete links.
This is the order of how I'm rendering the comment form and the comments from partials:
<h2>Comments</h2>
<%= render 'comments/form' %>
<%= render #recipe.comments %>
This is the code for _form.html.erb
<%= form_for([#recipe, #recipe.comments.build]) do |f| %>
<p><%= f.label 'Comment' %> <br> <%= f.text_area :comment %></p>
<p><%= f.submit 'Post' %></p>
<% end %>
This is the code for _comment.html.erb
<div class="show-text-formatting">
<p><strong><%= comment.name %></strong></p>
<p><%= comment.comment %></p>
<%= link_to 'Delete', [comment.recipe, comment], method: :delete,
data: { confirm: 'Are you sure want to delete this comment?' } %>
</div>
The first delete link have the extension: /recipes/10/comments/1 (1 is the comment id #)
Also, when I hover over the second delete link has the extension: /recipes/10/comment
The difference between is that the second delete link's extension doesn't have a comment id
I know that by switching the order of
<h2>Comments</h2>
<%= render 'comments/form' %>
<%= render #recipe.comments %>
to
<h2>Comments</h2>
<%= render #recipe.comments %>
<%= render 'comments/form' %>
would solve my problem, but I want the form to come before the comments.
EDIT:
The second delete link isn't actually a "second" delete link. It's a delete link for a null object. I still don't know how to get rid of it though.
Try this. Set an order to your comments. Like this:
<h2>Comments</h2>
<%= render 'comments/form' %>
<%= render #recipe.comments.order(created_at: :DESC) %>
That should fix your problem. I've had the same issue and it worked for me.
If you know for sure it's nil object, why don't you add a trigger. I mean we can check the object whether it's nil or not before rendering.
Im trying to render a form from another controller in my view.
This is posts_index, and the render post.comments works fine, but the form for a new comment doesnt.
<% #posts.each do |post| %>
<%= link_to post.title, post %>
<%= simple_format post.text %>
<%= render post.comments.order('created_at DESC').all %>
<%= render :partial => '/comments/form', locals: {post: post} %>
I get this error: undefined method `comments' for nil:NilClass
The comments form:
<%= form_for([#post, #post.comments.build]) do |f| %>
<%= f.label :Comment %><br />
<%= f.text_area :body, :class => "comment_text_box" %>
<%= f.submit %>
<% end %>
I understand I need to pass the post.comments to the form, but can't figure out how.
Post_show works with <%= render "comments/form" %>
Post and comments are a has_many relationship, posts has_many comments.
Thanks for looking.
You need to pass variables into your partial like this:
<% #posts.each do |post| %>
<%= link_to post.title, post %>
<%= simple_format post.text %>
<%= render post.comments.order('created_at DESC').all %>
<%= render partial: '/comments/form', locals: {post: post} %>
<% end %>
and change your form partial to this:
<%= form_for([post, post.comments.build]) do |f| %>
// form fields
<% end %>
When you ask for the partial, you need to send it the post it's related to. It would look like this:
<% #posts.each do |post| %>
<%= link_to post.title, post %>
<%= simple_format post.text %>
<%= render post.comments.order('created_at DESC').all %>
<%= render :partial => '/comments/form', post: post%>
Is it possible to check submission before showing this simple form:
<%= form_for #article, url: {action: "create"}, html: {class: "nifty_form"} do |f| %>
<%= f.text_field :title %>
<%= f.text_area :body, size: "60x12" %>
<%= f.submit "Create" %>
<% end %>
like if its already submitted first time show other html content instead ?
Test the object. If you're using ActiveRecord/Mongoid:
<% if #article.new_record? %>
... display form ...
<% else %>
... do something different ...
<% end %>
I am trying to render a partial on a page in rails. For some reason the code is not being rendered into html. I have tried taking it out of the partial and just placing it in the profile page but still nothing. I am getting no errors and have restarted the server but still nothing. This is in development mode. Also all code except the message code works fine. Any help would be appreciated. Here is the code.
profile.html.erb
<% unless #pictures.nil? %>
<div id="container" style="width: 500px; height: 450px;">
<div id="slides">
<% #pictures.each do |picture| %>
<%= image_tag(picture.image.url(:thumbnail)) %>
<% end %>
<%= image_tag("left.png") %>
<%= image_tag("right.jpeg") %>
</div>
</div>
<% end %>
<% render 'message' %>
_message.html.erb
<% form_for #message, :url => messages_create_path do |f| %>
<% f.hidden_field :from, value: current_user.id %>
<% f.hidden_field :to, value: #user.id %>
<% f.text_area :message %><br />
<% f.submit "Send Message" %>
<% end %>
To make your form_for code block to render you need to use <%= tag as follows:
<%= form_for #message, :url => messages_create_path do |f| %>
<% f.hidden_field :from, value: current_user.id %>
<% f.hidden_field :to, value: #user.id %>
<% f.text_area :message %><br />
<% f.submit "Send Message" %>
<% end %>
To elaborate on vinodadhikary's answer, ERB has output tags and evaluation tags. To evaluate something you would use <% expression %>, and to output you would use <%= output.me %>. The earlier is usually used for flow control in templates, and outputs nothing. The output happens within after a decision is made. The latter is used to output stuff.