Question

我有表单的字段，想与select2

一起使用

<%= f.collection_select :product_ids, Product.all,:id, :name ,{},{ class: 'p_ids', multiple: true} %>

我的js

   $(document).ready(function () {
    $(".p_ids").select2({
        tags:true,
        tokenSeparators: [",", " "]
    });
});

我的参数

params.require(:cost).permit(:day, :amount, :description, :source, product_ids:[])

但我有

Product(#70204276011560) expected, got NilClass(#70204185305100) 记录

"cost"=>{"day"=>"15-10-2016", "amount"=>"100", "description"=>"test", "source"=>"products", "product_ids"=>["", "1", "2"]}

如何解决？

Answer 1

我猜这个错误是由日志中product_ids数组的头部的空值发生的。

"product_ids"=>["", "1", "2"]

你可以通过include_hidden：false选项删除空值，如下所示。

<%= f.collection_select :product_ids, Product.all, :id, :name, { include_hidden: false }, { class: 'p_ids', multiple: true } %>

Answer 2

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(600/dpi, 300/dpi), dpi=dpi)

js部分就是那个

<%= f.select :product_ids, Product.all.order(:name).collect{|c| [ c.name, c.id] }, {include_blank: false }, id: 'p_ids_selection', multiple: true, class: 'multiple' %>

Rails AssociationTypeMismatch

2 个答案: