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# encoding: utf-8
module Formtastic
# Generates a Formtastic form partial based on an existing model. It will not overwrite existing
# files without confirmation.
#
# @example
# $ rails generate formtastic:form Post
# @example Copy the partial code to the pasteboard rather than generating a partial
# $ rails generate formtastic:form Post --copy
# @example Return HAML or Slim output instead of default ERB
# $ rails generate formtastic:form Post --template-engine haml
# $ rails generate formtastic:form Post --template-engine slim
# @example Generate a form for specific model attributes
# $ rails generate formtastic:form Post title:string body:text
# @example Generate a form for a specific controller
# $ rails generate formtastic:form Post --controller admin/posts
class FormGenerator < ::Rails::Generators::NamedBase
desc "Generates a Formtastic form partial based on an existing model."
argument :name, :type => :string, :required => true, :banner => 'MODEL_NAME'
argument :attributes, :type => :array, :default => [], :banner => 'attribute attribute'
source_root File.expand_path('../../../templates', __FILE__)
class_option :template_engine
class_option :copy, :type => :boolean, :default => false, :group => :formtastic,
:desc => 'Copy the generated code the clipboard instead of generating a partial file."'
class_option :controller, :type => :string, :default => false, :group => :formtastic,
:desc => 'Generate for custom controller/view path - in case model and controller namespace is different, i.e. "admin/posts"'
def create_or_show
@attributes = reflected_attributes if @attributes.empty?
engine = options[:template_engine]
if options[:copy]
template = File.read("#{self.class.source_root}/_form.html.#{engine}")
erb = ERB.new(template, nil, '-')
generated_code = erb.result(binding).strip rescue nil
puts "The following code has been copied to the clipboard, just paste it in your views:" if save_to_clipboard(generated_code)
puts generated_code || "Error: Nothing generated. Does the model exist?"
else
empty_directory "app/views/#{controller_path}"
template "_form.html.#{engine}", "app/views/#{controller_path}/_form.html.#{engine}"
end
end
protected
def controller_path
@controller_path ||= if options[:controller]
options[:controller].underscore
else
name.underscore.pluralize
end
end
def reflected_attributes
columns = content_columns
columns += association_columns
end
def model
@model ||= name.camelize.constantize
end
# Collects content columns (non-relation columns) for the current class.
# Skips Active Record Timestamps.
def content_columns
model.content_columns.select do |column|
!Formtastic::Helpers::InputsHelper::SKIPPED_COLUMNS.include? column.name.to_sym
end
end
# Collects association columns (relation columns) for the current class. Skips polymorphic
# associations because we can't guess which class to use for an automatically generated input.
def association_columns
model.reflect_on_all_associations(:belongs_to).select do |association_reflection|
association_reflection.options[:polymorphic] != true
end
end
def save_to_clipboard(data)
return unless data
begin
case RUBY_PLATFORM
when /win32/
require 'win32/clipboard'
::Win32::Clipboard.data = data
when /darwin/ # mac
`echo "#{data}" | pbcopy`
else # linux/unix
`echo "#{data}" | xsel --clipboard` || `echo "#{data}" | xclip`
end
rescue LoadError
false
else
true
end
end
end
end
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