以下是views / products / edit.html.erb中的相关代码:
<%= form_for(:product,:url => {:action => 'update',:id => @product.id}) do |f| %> <%= render(:partial => "form",:locals => {:f => f}) %> <%= submit_tag("Update Product") %> <% end %>
来自views / products / _form.html.erb:
<%= select_with_new_option(f,:shop,:name,:id) %>
从helpers / products_helper.rb:
def select_options_with_create_new(objects,text_field,value_field,options={}) object = objects.to_s.singularize all_objects = object.capitalize.constantize.all all_objects = all_objects.sort_by(&options[:order_by]) if options.has_key?(:order_by) select_options = all_objects.map{ |obj| [obj.send(text_field),obj.send(value_field)] } select_options << [wrap_create_new_option("create new #{object}".titleize),"new_#{object}"] options_for_select(select_options) end def wrap_create_new_option(str) ">> #{str} <<" end # By default,sorts by 'text_field'. def select_with_new_option(f,object,value_field) f.select(:"#{object}_id",select_options_with_create_new(object.pluralize,:order_by => text_field)) end
我希望默认情况下选择框为@ product.shop_id,但这不是真的(第一个选项始终是默认值).
我错过了什么?
解决方法
好吧,我明白了.只需删除select_options_with_create_new方法中的options_for_select(select_options)即可.
options_for_select将2-d数组select_options组装成一个html选项字符串,但是,select表单帮助程序可以接受它,但不指定所选属性.只需将2-d数组作为第二个参数传递给select方法,它就会自动分配所选的数组.
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