Trying not to repeat myself with Rails data manipulation - ruby-on-rails

Question

I'm fairly new to rails, an an intermediate programmer in general, but I'll try to be as clear as I can.
I have a database table for Products, which owns a field called category. Category has two possible values, call them Category1 and Category 2. The goal is to retrieve all the Products and display them in HTML organized by Category. I can make this work, but I know there has to be a better way.
My method now is to get my Products like so:
#category1_products = Product.all(conditions: { category: "Category1" })
#category2_products = Product.all(conditions: { category: "Category2" })
and then output the data something like this:
<table>
<tr>
<td>Category1 Name</td>
<% #category1_products.each do |product| %>
<td><%= product.name %></td>
<td><%= product.description %></td>
<td><%= product.price %></td>
<% end %>
</tr>
<tr>
<td>Category2 Name</td>
<% #category2_products.each do |product| %>
<td><%= product.name %></td>
<td><%= product.description %></td>
<td><%= product.price %></td>
<% end %>
</tr>
</table>
I would like to accomplish this using a single instance: get all Products at once, group them by Category, and then output them by looping through one Category at a time (including the Category Names). This seems like a pretty elementary concept to me, but I'm having trouble getting my head around it.

Answer 1

#products_by_category = Product.all.group_by(&:category)
This is a Ruby (read: not ActiveRecord) method to turn an Array into a Hash based on some condition of the objects it contains.
In your view (assuming you want one row per product, and not one per category):
<table>
<% #products_by_category.each do |category,products| %>
<tr>
<th><%= category %></th>
</tr>
<% products.each do |product| %>
<tr>
<td><%= product.name %></td>
<td><%= product.description %></td>
<td><%= product.price %></td>
</tr>
<% end %>
<% end %>
</table>

Answer 2

Rails' group_by is great for this type of problem:
#grouped_products = Product.all.group_by(&:category)
and then in the view, just loop over #grouped_products:
<table>
<tr>
<% #grouped_products.each do |category, products| %>
<td><%= category %></td>
<% products.each do |product| %>
<td><%= product.name %></td>
<td><%= product.description %></td>
<td><%= product.price %></td>
<% end %>
<% end %>
</tr>
</table>