集合中的多个选择 [英] Multiple select in collection

问题描述

我知道如何在我的字段上允许多项选择

我有一个简单的_form字段，如下所示

<%= f.input :activity, required: true, autofocus: true, label: "Votre Activité", collection: ["Vente", "Location", "Gestion", "Syndic"] %>

在我的控制器中

devise_parameter_sanitizer.permit(:account_update, keys: [:password, :password_confirmation, :photo, :address, :cover, :activity)

我的模特

validates :activity, inclusion: { in: %w(Vente Location Syndic Gestion),
        message: "%{value} n'est pas un mandat valide"}

我试过way，但不起作用，我认为问题出在活动变量类型

app/models/your_model.rb：

推荐答案

class YourModel < ApplicationRecord
  serialize :activity, Array # add this

  # you can't use `inclusion:` validation because it is only for validating a single value
  # so you'll do something like this, or if you want it to clean it a bit by defining a method instead, see here https://stackoverflow.com/questions/13579357/validates-array-elements-inclusion-using-inclusion-in-array
  validate do
    unless %w(Vente Location Syndic Gestion).include? activity
      errors.add(:activity, "#{activity} n'est pas un mandat valide"
    end
  end
end

app/views/.../some_view.html.erb：

<%= f.input :activity,
      required: true,
      autofocus: true,
      label: "Votre Activité",
      collection: ["Vente", "Location", "Gestion", "Syndic"],
      input_html: { multiple: true },
      include_hidden: false
%>

• 我在上面添加了input_html: { multiple: true }，以便params将是一个值数组，而不仅仅是单个值

• 我在上面添加了include_hidden: false，因为如果没有它，您将得到类似

  的内容

  ["", "Location", "Syndic"]
  

  添加空字符串，而不是只添加..

  ["Location", "Syndic"]
  

  • 详细信息here

app/controllers/some_controller.rb：

devise_parameter_sanitizer.permit(
  :account_update,
  keys: [
    :password,
    :password_confirmation,
    :photo,
    :address,
    :cover,
    activity: [] # change this from :activity
  )

测试工作

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