Class: Skyline::FormBuilder

Inherits:
ActionView::Helpers::FormBuilder
  • Object
show all
Defined in:
lib/skyline/form_builder.rb

Overview

Provides error wrapping and some extra helper methods to working with labels and translations easier.

Apart from adding new helper methods, this class overwrites the standard *_field and *_select helpers. If one of the fields has an error, the validation errors for that method are added just after the field. See #wrap_with_error for more information on what get’s added.

Instance Method Summary collapse

Instance Method Details

#dom_id(attribute, options = {}) ⇒ String

The ID that a field for a certain field would get.

Parameters:

  • attribute (String, Symbol) —

    The attribute to use for the id

Returns:

  • (String) —

    A sting containing the ID for the field



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# File 'lib/skyline/form_builder.rb', line 162

def dom_id(attribute,options={})
  CustomInstanceTag.new(@object_name, attribute, @template, objectify_options(options)).to_id(@options)
end

#fieldset_errors(attribute) ⇒ String?

Generates a list of errors. Each error is wrapped in a 

<div class="error">...</div>

Parameters:

  • attribute (String, Symbol) —

    The attribute to get the errors for

Returns:

  • (String, nil) —

    A string containing each error in a div or nil if there are no errors.



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# File 'lib/skyline/form_builder.rb', line 146

def fieldset_errors(attribute)
  return unless @object.errors[attribute]
  out = []
  if errs = @object.errors[attribute]
    errs = [errs] if self.single_error_message?(errs)
    out = errs.map do |err|        
      @template.content_tag("div",err,:class => "error")
    end
  end
  out.join("\n")
end

#has_error?(attribute) ⇒ Boolean

Does the object have any errors set on an attribute.

Parameters:

  • attribute (String, Symbol) —

    The attribute to check for errors

Returns:

  • (Boolean) 


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# File 'lib/skyline/form_builder.rb', line 90

def has_error?(attribute)
  @object.errors[attribute].present?
end

#label(method, text = nil, options = {}) ⇒ String

An improved version of the standard label helper it will append the class “invalid”

Returns:

  • (String)

See Also:

  • ActionView::Helpers::FormBuilder#label


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# File 'lib/skyline/form_builder.rb', line 43

def label(method, text = nil, options = {})
  if @object.errors[method]
    super(method,text,options.merge(:class => "invalid #{options[:class]}".strip))
  else
    super
  end    
end

#label_with_text(method, options = {}) ⇒ String

Same as label but automatically translates the field name

Returns:

  • (String)

See Also:



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# File 'lib/skyline/form_builder.rb', line 56

def label_with_text(method, options = {})
  self.label(method, self.t(method), options)
end

#object_name_with_index ⇒ String

Add the index of the current scope to the object_name if an index is used.

Returns:

  • (String) —

    The object_name with an optional index added



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# File 'lib/skyline/form_builder.rb', line 97

def object_name_with_index
  if options[:index].present?
    self.object_name + "[#{options[:index]}]"
  else
    self.object_name
  end
end

#positioning_field ⇒ Object

Special field to handle automated reordering of elements ( with help of NestedAttributesPositioning module)

Examples:

Usage:

<% article_form.fields_for "sections_attributes", section, :index => 5 do |s| %>
  <%= s.hidden_field :id unless s.object.new_record? %>
  <%= s.hidden_field :_destroy, :class => "delete" %>
  <%= s.positioning_field %>
  ...
<% end %>

Results in the following fields:

<input type="hidden" name="article[sections_attributes][5][id]" id="article_sections_attributes_5_id"      value="2211"/>
<input type="hidden" name="article[sections_attributes][5][_destroy]" id="article_sections_attributes_5__destroy" class="delete"/>
<input type="hidden" name="article[sections_position][]"  id="article_sections_position_5" value="5"/>


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# File 'lib/skyline/form_builder.rb', line 76

def positioning_field
  name = self.object_name.sub(/\[([^\]]*)_attributes\]$/, "[\\1_position]") + "[]"
  value = options[:index]    
  raise "No options[:index] defined, need one to use for ordering correctly." unless value
  
  tag_id = name.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").sub(/_$/, "") + value.to_s

  @template.hidden_field_tag name, value, :id => tag_id
end

#t(attribute, options = {}) ⇒ String

Translation for an attribute of that’s used in this formbuilder. Uses ActiveRecord::Base#human_attribute_name

Parameters:

  • attribute (~to_s) —

    The attribute to get the translation for

  • options (Hash) (defaults to: {}) —

    Options to pass to ActiveRecord::Base#human_attribute_name

Returns:

  • (String) —

    The translated attribute name.



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# File 'lib/skyline/form_builder.rb', line 172

def t(attribute, options = {})
  self.object.class.human_attribute_name(attribute.to_s, options)
end

#wrap_with_error(method, *parms) {|parameters| ... } ⇒ String

Wrap an input element with errors, also appends “invalid” to the helpers class. See #fieldset_errors on how the errors are added.

Parameters:

  • method (Symbol, String) —

    The method/attribuet to check for errors

  • parms —
  • options (Hash) —

    Options to pass to the original field helper, the key :text_suffix is stripped off

Yields:

  • (parameters) —

    The return value of the block will be wrapped with the error

Yield Parameters:

  • parameters (Hash) —

    The parameters to pass to the block (is the same as the parms of the method)

Returns:

  • (String) 


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# File 'lib/skyline/form_builder.rb', line 120

def wrap_with_error(method,*parms,&block)
  options = parms.extract_options!
  method_options = options.except(:text_suffix)
  
  if @object.errors[method]
    method_options[:class] ||= ""
    method_options[:class] << " invalid"
  end
  
  parms << method_options if method_options.any?    
  html = yield(parms)
  html << options[:text_suffix] if options[:text_suffix]

  if @object.errors[method]
    html + fieldset_errors(method)
  else
    html
  end
  
end