In my controller I do:
@categories = Category.all
for i in @[email protected]
@allposts.push(Post.where(:Category => i))
end
In views(haml) i do
<% @allposts.each do |posts, slots| %>
<% @slots.each do |post| %>
<%= post.Title %>
<% end %>
<% end %>
And i see this error:
undefined method `each' for nil:NilClass on @slots.each do |post|.
Thank you in advance.
You haven't defined @slots in the method.Perhaps you mean slots.
<% @allposts.each do |posts, slots| %>
<% slots.each do |post| %>
<%= post.Title %>
<% end %>
<% end %>
Fix is :
<% @allposts.each do |posts, slots| %>
<% slots.each do |post| %> # <--- see I removed @ symbol
<%= post.Title %>
<% end %>
<% end %>
Your block variable is slots, and you attempted as @slots. Which I think is a typo. As there is no such @slots variable defined, you got nil, when you wanted to use it. There is a sweet difference between local variable and instance variable. If you don't defined anywhere a local variable say foo, you will be ended up with undefined local variable or method if you want to use foo anywhere else.But for instance variable, no error, you will silently get nil.
@slots? As inside the block you created as|posts, slots|...Categoryis associated with modelPostwith1-M relationshipthen you can simply loop over@categorieslike@categories.each do |category|category.poststo get all the posts associated with a given category. Why to make multidimensional arrays and complicate it?