Question

I have tried a couple other similar posts but am still getting an error.

In the Posts model I have a category_id field. I have the following models:

#Posts model
belongs_to :categories  

#Category model
has_many :posts

In the Posts index controller I have:

@categories = @posts.Category.find(:all, :order => 'categoryname')

In the View I have:

<% @posts.each do |post| %>
<tr>
<td><%= post.category_id %></td>
<td><%= @categories.categoryname %></td>

<td><%= link_to 'View', post %></td>
<td><%= link_to 'Edit', edit_post_path(post) %></td>
</tr>
<% end %>

In the 2nd column I am trying to show the category name (“categoryname”) from the Category table instead of the category_id from the posts table. I am getting an error:

undefined method `Category’ for #ActiveRecord::Relation:0x3e1a9b0>

I have also tried:

<td><%= post.categories.categoryname %></td>

But get the same error.

As well as:

<td><%= post.category.categoryname %></td>

Any suggestions would be greatly appreciated.

Answer 1

In your model

belongs_to :category

In your view

<td><%= post.category.categoryname %></td>

You can get rid of the @categories = line in your controller

Also, categoryname is probably not the best attribute name for your Category model. Why not just name it name. post.category.name seems a lot better than post.category.categoryname, don’t you think?