Recursive function to build a tree of folders based on API JSON data

box_folder.rb

def get_tree(folder)
    items = folder.items

    items.each do |item|
      if item.type == "folder"
        puts item.parent
      end
    end
  end

  def create_box_folder_tree
    @tree = []
    root_folders = self.box_client.root_folder.folders

    root_folders.each do |folder|
      self.get_tree(folder)
    end
  end

boxes_controller.rb

def export
    current_user.update_box_tokens
    box_folders = BoxFolder.new(:access_token => current_user.oauth2_users.find_by_provider('box_oauth2').access_token)
    box_folders.create_box_folder_tree
end

Sample Data

{
    "type": "folder",
    "id": "11446498",
    "sequence_id": "1",
    "etag": "1",
    "name": "Pictures",
    "created_at": "2012-12-12T10:53:43-08:00",
    "modified_at": "2012-12-12T11:15:04-08:00",
    "description": "Some pictures I took",
    "size": 629644,
    "path_collection": {
        "total_count": 1,
        "entries": [
            {
                "type": "folder",
                "id": "0",
                "sequence_id": null,
                "etag": null,
                "name": "All Files"
            }
        ]
    },
    "created_by": {
        "type": "user",
        "id": "17738362",
        "name": "sean rose",
        "login": "sean@box.com"
    },
    "modified_by": {
        "type": "user",
        "id": "17738362",
        "name": "sean rose",
        "login": "sean@box.com"
    },
    "owned_by": {
        "type": "user",
        "id": "17738362",
        "name": "sean rose",
        "login": "sean@box.com"
    },
    "shared_link": {
        "url": "https://www.box.com/s/vspke7y05sb214wjokpk",
        "download_url": null,
        "vanity_url": null,
        "is_password_enabled": false,
        "unshared_at": null,
        "download_count": 0,
        "preview_count": 0,
        "access": "open",
        "permissions": {
            "can_download": true,
            "can_preview": true
        }
    },
    "folder_upload_email": {
        "access": "open",
        "email": "upload.Picture.k13sdz1@u.box.com"
    },
    "parent": {
        "type": "folder",
        "id": "0",
        "sequence_id": null,
        "etag": null,
        "name": "All Files"
    },
    "item_status": "active",
    "item_collection": {
        "total_count": 1,
        "entries": [
            {
                "type": "file",
                "id": "5000948880",
                "sequence_id": "3",
                "etag": "3",
                "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc",
                "name": "tigers.jpeg"
            }
        ],
        "offset": 0,
        "limit": 100
    },
    "tags": [
        "approved",
        "ready to publish"
    ]
}

working_ruby_example.rb

current_user.update_box_tokens

    box_session = RubyBox::Session.new({
      client_id: BOX_KEYS[:client_id],
      client_secret: BOX_KEYS[:client_secret],
      access_token: current_user.oauth2_users.find_by_provider('box_oauth2').access_token
    })

    box_client = RubyBox::Client.new(box_session)
    folders = box_client.root_folder.folders

    @tree = []
    folders.each do |folder|
      children = []
      folder.items.each do |child|
        if child.type == "folder"
          children << {
            title: child.name,
            key: child.id,
            isFolder: true
          }
        end
      end

      @tree << {
        title: folder.name,
        key: folder.id,
        isFolder: true,
        children: children
      }
    end