diff --git a/app/helpers/settings_helper.rb b/app/helpers/settings_helper.rb
deleted file mode 100644
index aca9fdf..0000000
--- a/app/helpers/settings_helper.rb
+++ /dev/null
@@ -1,144 +0,0 @@
-module SettingsHelper
-  def field(form, key, opts = {})
-    html = '<div class="form-group">'
-
-    field_resolver(html, form, key, opts)
-
-    html << "</div>"
-    html.html_safe
-  end
-
-  private
-
-  def field_resolver(html, form, key, opts)
-    plugin_class = form.object.class
-    type = plugin_class.column_type(key)
-    if type && !@_used_param.key?(key)
-      case type
-      when :enum
-        enum_field(html, form, key, opts)
-      when :bool
-        bool_field(html, form, key, opts)
-      else
-        other_field(html, form, key, opts)
-      end
-      @_used_param[key] = true
-    end
-    if plugin_class._sections[key] && !@_used_section.key?(key)
-      section_field(html, form, key, opts)
-      @_used_section[key] = true
-    end
-  end
-
-  def section_field(html, form, key, opts = {})
-    klass = form.object.class._sections[key]
-    children = form.object.__send__(key) || { "0" => {} }
-    # <parse>/<format> section is not multiple in most cases
-    multi = if [:parse, :format].include?(key)
-              false
-            else
-              klass.multi
-            end
-
-    children.each do |index, child|
-      open_section_div(html, multi) do |_html|
-        _html << append_and_remove_links if multi
-        _html << h(form.label(key))
-        _html << section_fields(form, key, index, klass, child)
-      end
-    end
-  end
-
-  def open_section_div(html, multi)
-    html << %Q!<div class="js-nested-column #{ multi ? "js-multiple" : "" } well well-sm">!
-    yield html
-    html << "</div>"
-  end
-
-  def section_fields(form, key, index, klass, child)
-    html = ""
-    object = klass.new(child)
-    form.fields_for("#{key}[#{index}]", object) do |ff|
-      klass._types.keys.each do |kk|
-        if kk == :type
-          html << owned_plugin_type_field(ff, kk, key)
-        else
-          html << field(ff, kk)
-        end
-      end
-    end
-    html
-  end
-
-  def nested_field(html, form, key, opts = {})
-    klass    = child_data(form, key)[:class]
-    options  = child_data(form, key)[:options]
-    children = form.object.send(key) || {"0" => {}}
-
-    children.each_pair do |index, child|
-      html << open_nested_div(options[:multiple])
-      html << append_and_remove_links if options[:multiple]
-      html << h(form.label(key))
-      html << nested_fields(form, key, index, klass, child)
-      html << "</div>"
-    end
-  end
-
-  def open_nested_div(multiple)
-    %Q!<div class="js-nested-column #{ multiple ? "js-multiple" : "" } well well-sm">!
-  end
-
-  def nested_fields(form, key, index, klass, child)
-    nested_html = ""
-    form.fields_for("#{key}[#{index}]", klass.new(child)) do |ff|
-      klass::KEYS.each do |k|
-        nested_html << field(ff, k)
-      end
-    end
-
-    nested_html
-  end
-
-  def append_and_remove_links
-    %Q!<a class="btn btn-xs btn-default js-append">#{icon('fa-plus')}</a> ! +
-    %Q!<a class="btn btn-xs btn-default js-remove" style="display:none">#{icon('fa-minus')}</a> !
-  end
-
-  def child_data(form, key)
-    form.object.class.children[key]
-  end
-
-  def enum_field(html, form, key, opts = {})
-    html << h(form.label(key))
-    html << " " # NOTE: Adding space for padding
-    html << form.select(key, form.object.list_of(key), opts, { class: "enum" })
-  end
-
-  def bool_field(html, form, key, opts = {})
-    html << form.check_box(key, {}, "true", "false")
-    html << " " # NOTE: Adding space for padding
-    html << h(form.label(key))
-  end
-
-  def other_field(html, form, key, opts = {})
-    return unless form.object.respond_to?(key)
-    html << h(form.label(key))
-    html << form.text_field(key, class: "form-control")
-  end
-
-  def owned_plugin_type_field(form, key, plugin_type)
-    registry_type = case plugin_type
-                    when :parse
-                      "PARSER_REGISTRY"
-                    when :format
-                      "FORMATTER_REGISTRY"
-                    end
-    plugin_registry = Fluent::Plugin.const_get("#{registry_type}")
-    html = '<div class="form-group">'
-    html << form.label(key)
-    html << " " # NOTE: Adding space for padding
-    html << form.select(key, plugin_registry.map.keys, {}, { class: "owned" })
-    html << '</div>'
-    html
-  end
-end