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module NestedForm
module BuilderMixin
# Adds a link to insert a new associated records. The first argument is the name of the link, the second is the name of the association.
#
# f.link_to_add("Add Task", :tasks)
#
# You can pass HTML options in a hash at the end and a block for the content.
#
# <%= f.link_to_add(:tasks, :class => "add_task", :href => new_task_path) do %>
# Add Task
# <% end %>
#
# You can also pass <tt>model_object</tt> option with an object for use in
# the blueprint, e.g.:
#
# <%= f.link_to_add(:tasks, :model_object => Task.new(:name => 'Task')) %>
#
# See the README for more details on where to call this method.
def link_to_add(*args, &block)
options = args.extract_options!.symbolize_keys
association = args.pop
unless object.respond_to?("#{association}_attributes=")
raise ArgumentError, "Invalid association. Make sure that accepts_nested_attributes_for is used for #{association.inspect} association."
end
model_object = options.delete(:model_object) do
reflection = object.class.reflect_on_association(association)
reflection.klass.new
end
options[:class] = [options[:class], "add_nested_fields"].compact.join(" ")
options["data-association"] = association
options["data-blueprint-id"] = fields_blueprint_id = fields_blueprint_id_for(association)
args << (options.delete(:href) || "javascript:void(0)")
args << options
@fields ||= {}
@template.after_nested_form(fields_blueprint_id) do
blueprint = {:id => fields_blueprint_id, :style => 'display: none'}
block, options = @fields[fields_blueprint_id].values_at(:block, :options)
options[:child_index] = "new_#{association}"
blueprint[:"data-blueprint"] = fields_for(association, model_object, options, &block).to_str
@template.content_tag(:div, nil, blueprint)
end
@template.link_to(*args, &block)
end
# Adds a link to remove the associated record. The first argment is the name of the link.
#
# f.link_to_remove("Remove Task")
#
# You can pass HTML options in a hash at the end and a block for the content.
#
# <%= f.link_to_remove(:class => "remove_task", :href => "#") do %>
# Remove Task
# <% end %>
#
# See the README for more details on where to call this method.
def link_to_remove(*args, &block)
options = args.extract_options!.symbolize_keys
options[:class] = [options[:class], "remove_nested_fields"].compact.join(" ")
# Extracting "milestones" from "...[milestones_attributes][...]"
md = object_name.to_s.match /(\w+)_attributes\]\[[\w\d]+\]$/
association = md && md[1]
options["data-association"] = association
args << (options.delete(:href) || "javascript:void(0)")
args << options
hidden_field(:_destroy) << @template.link_to(*args, &block)
end
def fields_for_with_nested_attributes(association_name, *args)
# TODO Test this better
block = args.pop || Proc.new { |fields| @template.render(:partial => "#{association_name.to_s.singularize}_fields", :locals => {:f => fields}) }
options = args.dup.extract_options!
# Rails 3.0.x
if options.empty? && args[0].kind_of?(Array)
options = args[0].dup.extract_options!
end
@fields ||= {}
@fields[fields_blueprint_id_for(association_name)] = { :block => block, :options => options }
super(association_name, *(args << block))
end
def fields_for_nested_model(name, object, options, block)
classes = 'fields'
classes << ' marked_for_destruction' if object.respond_to?(:marked_for_destruction?) && object.marked_for_destruction?
perform_wrap = options.fetch(:nested_wrapper, true)
perform_wrap &&= options[:wrapper] != false # wrap even if nil
if perform_wrap
@template.content_tag(:div, super, :class => classes)
else
super
end
end
private
def fields_blueprint_id_for(association)
assocs = object_name.to_s.scan(/(\w+)_attributes/).map(&:first)
assocs << association
assocs.join('_') + '_fields_blueprint'
end
end
end
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