rails how to show catery name if user select sub_category?

Question

in my app users has_many categories categories have sub_categories in db i create parent_id with main category id

and now i dont know how show main category if user select only sub_category User.rb

has_many :users_ecategories
  has_many :ecategories, through: :users_ecategories

Category.rb

class Ecategory < ActiveRecord::Base
    has_many :users_ecategories
    has_many :users, through: :users_ecategories
    has_many :ecategories, class_name: 'Ecategory', foreign_key: 'parent_id'
end

Users_categories.rb class UsersCategory < ActiveRecord::Base belongs_to :user belongs_to :ecategory end

views/user/show.html.erb

<% @user.ecategories.each do |ecategory| %>
                    <%= ecategory.name %>
                    <%= ecategory.id %>
                <% end %>

how to show main category name? <%= ecategory.parent_id.name %> doesn't work please help

Mohammad AbuShady · Accepted Answer · 2014-09-06 14:56:31Z

1

I think you need to define the parent relation

class Ecategory < ActiveRecord::Base
    has_many :users_ecategories
    has_many :users, through: :users_ecategories
    has_many :ecategories, class_name: 'Ecategory', foreign_key: 'parent_id'

    belongs_to :parent_ecategory, class_name: 'Ecategory', foreign_key: 'parent_id'

end

Then the call would be

<%= ecategory.parent_ecategory.name %>

answered Sep 6, 2014 at 14:56

Mohammad AbuShady

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2 Comments

user3089327 Over a year ago

thanks, i have only 1 question, if i use this <ul> <% @user.ecategories.each do |ecategory| %> <%= ecategory.parent.name %> <li> <ul> <% @user.ecategories.where(parent_id: ecategory.parent.id).each do |sub_ecategory| %> <li> <%= sub_ecategory.name %> </li> </ul> </li> </ul> ecategory.parent_ecategory.name duplicated but i need one category and all selected sub_categories

Mohammad AbuShady Over a year ago

Parent categoties are ones that don't have parents, so Ecategory.where(parent_id: nil) and @user.ecategories.where(parent_id: nil) are parent categories

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