Rails仅在字段嵌套形式的字段不为空的情况下保存记录

问题描述

在我的Rails应用程序中，我有一个 Kid 模型和一个 Allergy 模型，其中 Kid 具有很多过敏.我还创建了一个嵌套表单，以便在创建新的 kid 时， allergy 字段处于 kid 表单中.这是我的 kid 控制器中的内容:

In my Rails application I have a Kid model and an Allergy model where a Kid has_many Allergies. I have also created a nested form so that the allergy fields are in the kid form when creating a new kid. This is what I have in my kid controller:

def new
   @kid = Kid.new
   allergy = @kid.allergies.build
end

这是在我的index.html.erb中，该嵌套在我的create kid 表单中:

and this is in my index.html.erb nested in my create kidform:

<%= f.fields_for :allergies, Allergy.new do |u| %>
     <%= u.label :description, "Description", class: "control-label" %>    
     <%= u.text_field :description, class: "input-sm form-control" %>
     <%= u.label :symptoms, "Symptoms", class: "control-label",  %>    
     <%= u.text_field :symptoms, class: "input-sm form-control" %>
<%end%>

这仅适用于在 Allergy 模型中插入一个 Allergy 记录，但是我希望能够列出最多5个 Allergy 输入，并且仅插入用户填写的内容，因为儿童可能会有可变数量的过敏.

This works fine for inserting just one allergy record into the Allergy model, however I want to be able to list up to 5 allergy inputs, and only insert those ones that a user fills, as a kid could have a variable amount of allergies.

我使用了这篇文章: http://vicfriedman.github.io/blog/2015/07/18/create-multiple-objects-from-single-form-in-rails/

但是，我无法使它用于嵌套表单.感谢所有帮助，谢谢！

However, I could not make this work for a nested form. All help is appreciated, thanks!

推荐答案

要为您的关系获取多个嵌套表单，您将需要构建要在表单中显示的相关项目的数量，例如:

to get multiple nested forms for your relations you will need to build the number of related items you want to display in the form, something like:

def new
    @kid = Kid.new
    5.times do
        @kid.allergies.build
    end
end

然后拒绝在数据库中保存任何空关系，在模型中，您可以使用类似以下内容的方法:

to then reject saving any empty relations in the database, in the model you could use something like:

accepts_nested_attributes_for :allergies, reject_if: ->(allergy){ allergy['description'].blank? && allergy['symptoms'].blank? }

这篇关于Rails仅在字段嵌套形式的字段不为空的情况下保存记录的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！