ruby on rails 解决multiple select 存储和update
操作系统ubuntu，开发工具netbeans
vendor数据库表有字段service_category varchar(100)
<% form_for :vendor, @vendor, :url => sellers_path do |f| %>
<%= f.select(:service_category,
["Painting","Plumbing","Decor"], {}, {:multiple => true, :size => 3}) %>
<%= f.submit "Register"%>
<% end %>
url 指定到哪个control action，用的是rails rest技术
但是存入数据库表的是--\painting --之类的字符串，不符合要求
所以在vendor model中加入
def service_category=(values)
if !values.nil?
write_attribute('service_category', values.join(','))
end
end
def service_category
if !read_attribute('service_category').nil?
read_attribute('service_category').split(',')
end
end
存入数据库中的是painting，plumbing
在update action中@vendor = Vendor.find(id)
在update 页面<%= f.select(:service_category,
["Painting","Plumbing","Decor"], {}, {:multiple => true, :size => 3}) %>就能取出数据库中对应的数据
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