Question

我的观点中有以下内容：

<%= f.select :blood_group, options_for_select([
              ['O+', Membership.blood_groups.keys[0]], ['O-', Membership.blood_groups.keys[1]],
              ], @user.blood_group) %>

如何在上面添加include_blank属性？当我在最后附加它时，我得到错误“错误的参数数量（给定3，预期1..2）”

Answer 1

你可以这样做：

<%= f.select :blood_group, [['', nil], ['one', 1], ['two', 2], ['three', 3], ['four', 4], ['five', 5], ['', nil]]

可选择指定options_for_select，注意这会在开头和结尾添加两个空白字段。

Answer 2

您可以执行以下操作：

<%= f.select :blood_group, options_for_select([
    ['O+', Membership.blood_groups.keys[0]], 
    ['O-', Membership.blood_groups.keys[1]]], @user.blood_group, {include_blank: true}, {}) %>

您可以参考文档：options_for_select

使用options_for_select为f.select设置include_blank

2 个答案: