rails form nested hash in each do loop

Question

Here is my method

  def categories
    @categories = {}
    cat = Category.includes(:sub_categories).where('categories.status = ?', true).order(:id)        
    cat.each do |category|
        category.sub_categories.each do |sub_category|
            @categories[category.name] = { name: sub_category.name }
        end
    end
  end

What I am trying to do is

Assume my category.name is mobile phones and my sub_category.name will have list of mobile phone brands. But my above method prints one sub category only because the name is variable but how to create nested hash.

Any other proper method of doing this

Jorge de los Santos · Accepted Answer · 2014-06-14 03:19:01Z

4

That's because you are overwriting the key in each subcategory. You have to store an array of subcategories for each key:

{"name1"=>[{"subcategory1"=>...},{"subcategory2"=>...}],"name2"=>[]}

Try this:

  def categories
    @categories = {}
    cat = Category.includes(:sub_categories).where('categories.status = ?', true).order(:id)        
    cat.each do |category|
        category.sub_categories.each do |sub_category|
            @categories[category.name] = [] unless @categories[category.name]
            @categories[category.name] << { name: sub_category.name }
        end
    end
  end

Also if the category.status is a boolean, you can do:

cat = Category.includes(:sub_categories).where(status: true).order(:id)

And remove the sql query from a controller, which is ugly.

EDITED

As long as you have a hash of arrays, in order to render the view you will have to iterate again:

@categories.each do |category, values|
  values.each do |sub_category|
    subcategory["what you need"]
  end
end

edited Jun 14, 2014 at 3:19

answered Jun 14, 2014 at 2:49

Jorge de los Santos

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2 Comments

Prabhakaran Over a year ago

That is working I used like this in view <% @categories.each do |category, sub_category| %> I can show <%= category %> but how to view the sub_category I tried sub_category.name but throwing error

Jorge de los Santos Over a year ago

Because you have two hashes, not objects. Adding solution.

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