CODEWITHSUNDEEP
ruby-on-rails
Liz
Liz

Reputation: 1457

Rails Partial Local not Getting Passed Through

I have a bunch of possible options for the primary_category for a blog. Each has an associated icon, so I have them in a blogs/_category_icon.html.erb partial:

<% case @blog.primary_category

 when "General" %>
    <%= link_to blogs_path, class: "text-slate" do %>
      <i class="fas fa-book-open pr-2"></i> <%= @blog.primary_category %>
    <% end %>
  <% when "Motivation" %>
    <%= link_to page_path("motivation"), class: "text-slate" do %>
      <i class="fas fa-mountain pr-2"></i> <%= @blog.primary_category %>
    <% end %>
  <% when "Mindset" %>
    <%= link_to page_path("mindset"), class: "text-slate" do %>
      <i class="fas fa-brain pr-2"></i> <%= @blog.primary_category %>
    <% end %>
  <% when "Resourcing" %>
    <%= link_to page_path("resourcing"), class: "text-slate" do %>
      <i class="fas fa-first-aid pr-2"></i> <%= @blog.primary_category %>
    <% end %>
  <% when "Planning" %>
    <%= link_to page_path("planning"), class: "text-slate" do %>
      <i class="fas fa-sitemap pr-2"></i> <%= @blog.primary_category %>
    <% end %>
  <% when "Time Management" %>
    <%= link_to page_path("time-management"), class: "text-slate" do %>
      <i class="fas fa-stopwatch pr-2"></i> <%= @blog.primary_category %>
    <% end %>
  <% when "Discipline" %>
    <%= link_to page_path("discipline"), class: "text-slate" do %>
      <i class="fas fa-cookie-bite pr-2"></i> <%= @blog.primary_category %>
    <% end %>

<% end %>

It renders perfectly on my blog#show page with this:

<%= render "blogs/category_icon", locals: { blog: @blog } %>

However, when I try to call it on the blogs#index page from within a <% @blogs.each do |blog| %> block it's throwing up an error saying undefined method 'primary_category' for nil:NilClass.

The code on the blogs#index page is like this:

<% @blogs.each do |blog| %>
  ...
  <%= render "blogs/category_icon", locals: { blog: blog } %>
  ...
<% end %>

Can anyone see why this local isn't getting passed through properly?

Upvotes: 1

Views: 360

Answers (1)

Sebasti&#225;n Palma
Sebasti&#225;n Palma

Reputation: 33471

As stated in ActionView/PartialRenderer, you need to use the partial option:

<%= render partial: "blogs/category_icon", locals: { blog: blog } %>

Notice you can also use the option of rendering a collection of partials, but this time using a combination of collection and as options:

<%= render partial: "blogs/category_icon", collection: @blogs, as: :blog %>

The iteration through the elements of @blogs is handled by Rails.

Upvotes: 4

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