如何以Rails形式提交字符串数组 4.2

Question

我有一个带有字符串数组属性 recipients 的模型 message。这是我的 messages_controller.rb 的样子：

def new
  @message = Message.new
  @message.attachments = params[:attachments]
end
def create
  @message = Message.new(create_params)
  @message.user_id = current_user.id
  @message.attachments = params[:message][:attachments]
  @message.recipients = params[:message][:recipients]
  save_message or render 'new'
end
private
  def create_params
    params.require(:message).permit(:object, :content,
                                  :recipients,
                                  :attachments)
  end

_fields.html.erb 看起来像这样：

<%= render 'shared/error_messages', object: f.object %>
<%= f.label :object %>
<%= f.text_field :object, class: "form-control" %>
<%= f.label :recipients %>
<%= f.text_field :recipients, multiple: true, class: "form-control" %>
<%= f.label :attachments %><br>
<%= f.file_field :attachments, multiple: true, class: 'form-control' %><br />
<%= f.label :content %>
<%= f.text_area :content, class: "form-control" %>

问题是它像这样保存 recipients 数组：

["recipient_1, recipient_2"]

而不是

["recipient_1", "recipient_2"]

我希望能够检索收件人[0] = recipient_1 而不是收件人[0] = 整个数组。

这可能很简单，但我找不到解决方法。所有投入表示赞赏。谢谢

Answer 1

通常对于 permit 你传递一个 :symbols 的集合。这些键必须仅表示标量值。但是数组由空数组表示不同。

试试这个：

def create_params
    params.require(:message).permit(:object,
                                    :content,
                                    :attachments,
                                    recipients: [])
end

以及您表单中的字段：

<%= f.text_field_tag "recipients[]", :recipients, multiple: true, class: "form-control" %>

Answer 2

它返回一个字符串，因为输入是一个文本字段。如果你想为此使用文本字段，那么只需期望输入将以逗号分隔并拆分输入：

@message.recipients = params[:message][:recipients].split(',')

# or, if it's wrapped in an array
# @message.recipients = params[:message][:recipients][0].split(',')

如何以Rails形式提交字符串数组 4.2

How to submit a string array in a form Rails 4.2

ruby

arrays

postgresql

rails-postgresql

ruby-on-rails-4.2