如何在选择字段(琥珀色框架)中添加默认空白值?
== select_field(name:“parent_category_id”,collection:Category.all.map {| category | [category.id,category.name]},selected:“”,class:“form-control”)
利用Crystal Arrays可以连接的事实:
c = [["", "blank"]] + Category.all.map{|category| [category.id, category.name]}
select_field(
name: "parent_category_id",
collection: c,
selected: "",
class: "form-control"
)