FormBuilder object must be present. If there's no object, us

Error message

FormBuilder object must be present. If there's no object, use a symbol instead (i.e. :user)

What it means

Error "FormBuilder object must be present. If there's no object, use a symbol instead (i.e. :user)" thrown in padrino/padrino-framework.

Source

Thrown at padrino-helpers/lib/padrino-helpers/form_builder/abstract_form_builder.rb:13

module Padrino
  module Helpers
    module FormBuilder
      # Base class for Padrino Form Builder
      class AbstractFormBuilder
        attr_accessor :template, :object, :multipart
        attr_reader :namespace, :is_nested, :parent_form, :nested_index, :attributes_name, :model_name

        def initialize(template, object, options = {})
          @template = template
          raise 'FormBuilder template must be initialized' unless template
          @object = object.is_a?(Symbol) ? build_object(object) : object
          raise "FormBuilder object must be present. If there's no object, use a symbol instead (i.e. :user)" unless object
          @options = options
          @namespace = options[:namespace]
          @model_name = options[:as] || Inflections.underscore(@object.class).tr('/', '_')
          nested = options[:nested]
          if (@is_nested = nested && (nested_parent = nested[:parent]) && nested_parent.respond_to?(:object))
            @parent_form = nested_parent
            @nested_index = nested[:index]
            @attributes_name = "#{nested[:association]}_attributes"
          end
        end

        def error_messages(*params)
          @template.error_messages_for object, *params
        end

        def error_message_on(field, options = {})
          @template.error_message_on object, field, options
        end

View on GitHub (pinned to 167044f3d5)

When it happens

Trigger: Thrown at padrino-helpers/lib/padrino-helpers/form_builder/abstract_form_builder.rb:13 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of padrino/padrino-framework@167044f3d5 (2026-08-23). Data as JSON: /api/errors/6b87179f9ccb47f1. Report an issue: GitHub.