Ruby-on-rails Rails - simple_form，在新的集合中包含一个命名的空白对象并编辑
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Rails - simple_form, include a named blank object in a collection on new and edit
提问by bdx
I have a simple_form which I am trying to get to always include a blank item in it, as a 'nil' value in that field has a special meaning in this database. In order to make it more obvious for end users, I also want to title it with something along the lines of "(select if none)".
我有一个 simple_form，我试图让它始终包含一个空白项目，因为该字段中的“nil”值在此数据库中具有特殊含义。为了使最终用户更明显，我还想用“（如果没有，则选择）”这样的内容来命名它。
I'm currently doing this, but it only inserts the 'blank' item when creating a new object, not when editing one.
我目前正在这样做，但它只在创建新对象时插入“空白”项，而不是在编辑对象时插入。
# _child_form.html.erb
<%= simple_form_for @child do |f| %>
<%= f.input :first_name %>
<%= f.input :last_name %>
<%= f.association :parent, :collection => @parents, :prompt => "(select if none)" %>
<%= f.button.submit %>
<% end %>
.
.
# child_controller.rb
def new
@child = Child.new
@parents = Parent.all
end
def edit
@child = Child.find(params[:id])
@parents = Parent.all
end
回答by deefour
You want to use :include_blank, not :prompt
你想使用:include_blank，而不是:prompt
<%= f.association :parent, :collection => @parents, :include_blank => "(select if none)" %>
