rails form select multiple给出第一个空值

Question

我在膳食和食谱之间定义了has_and_belongs_to_many关联.在Meals创建表单中,我使用select来填充食谱.

<%= f.select :recipes, Recipe.all.collect { |x| [x.name, x.id]}, {}, :multiple => true %>

但结果集的第一个值为零.

"recipes"=>["", "2", "7"]

如何消除空/零值？

Answer 1

对我来说,设置:include_hidden => false是有效的

<%= f.select :recipes, Recipe.all.collect { |x| [x.name, x.id]}, {:include_hidden => false}, :multiple => true %>

Answer 2

您可以通过传递来拒绝空白选项:include_blank => false

<%= f.select :recipes, Recipe.all.collect { |x| [x.name, x.id]}, {:include_blank => false}, :multiple => true %>

您可以设置提示如下

<%= f.select :recipes, Recipe.all.collect { |x| [x.name, x.id]}, {:include_blank => "Please Select"}, :multiple => true %>