Question

I have an application that currently fetches data from mySQL DB. And I have a Person table which contains columns: Name, Gender, Email, Hobby and etc.

I want to implement a “grouping-like” feature so that users can be categorized into a group by specific columns (e.g. Gender)

What I have is something like this:

What I want to implement is to create two groups Boys/Girls by their gender and with a little + sign so that we can expand it and see what people is in the group:

What would be the best way to do this?
UPDATE:
My way to implements this:

my_controller.rb:

def index
  @people = Person.find_by_sql(*some sql stuff*)
  @persons = @people.group_by { |t| t.gender }
end

then in view file

view.html.erb
<% @persons.sort.each do |gender, person_list| %>
  <h2><%= gender %></h2>
  <% for person in person_list %>
    *some code here*
  <% end %>
<% end %>

Answer 1

You can uses scopes. In your Person model file, add the following:

scope :boys, where(:gender => "Male")
scope :girls, where(:gender => "Female")

Then in your controller, you can create variables for each gender group.

@boys = Person.boys
@girls = Person.girls

Finally iterate over @boys and @girls in your view.