我使用Rails根据一组复杂的嵌套属性自动创建子对象。因此,我需要以一种非常特殊的方式嵌套参数。显然,我意识到我可以使用JS随心所欲地构造它们,但我希望表单的顺序能够自动帮助构造。对于上下文,我有2列,用2个<td>
表示,每列可以创建一个新的记录,也可以编辑一个现有的记录。当然,当要修改现有记录时,必须传递记录的id。
呈现的HTML如下所示:
<td width="50%" style="padding-right:3%" class="logistic-details" data-type="logistics" data-typelogistics="delivery" data-instructions="test instructions" data-id="1" data-amount="20">
<span class="area-to-inject-amount-inputs" data-object="type_logistics" data-type="logistics" data-typelogistics="delivery">
<input class="labeler-response" name="type_logistics_attributes[][id]" type="hidden" value="1">
<input class="labeler-response" name="type_logistics_attributes[][instructions]" type="text" value="test instructions">
</span>
</td>
<td width="50%" style="padding-right:3%" class="logistic-details" data-type="logistics" data-typelogistics="pickup" data-instructions="" data-id="" data-amount="0">
<span class="area-to-inject-amount-inputs" data-object="type_logistics" data-type="logistics" data-typelogistics="pickup" data-actioned="charged">
<input type="hidden" name="type_logistics_attributes[][type_of_logistics]" value="pickup">
<input class="injected-amount-input" type="number" min="0" max="" placeholder="Amount" name="type_logistics_attributes[][charged_amounts_attributes][][amount]" value="20">
<span class="area-to-inject-type-of-amount">
<input type="hidden" name="type_logistics_attributes[][charged_amounts_attributes][][type_of_amount]" value="logistics">
</span>
<input class="labeler-response" name="type_logistics_attributes[][instructions]" type="text" placeholder="Enter address and instructions">
</span>
</td>
在本例中,第一个<td>
修改一个id为1的现有记录,而第二个<td>
提供创建新记录的参数。创建新记录时,也会创建子charged_amounts
。因此,这些参数是我所期望的:
"type_logistics_attributes"=>[
{"id"=>"1", "instructions"=>"test instructions"},
{"type_of_logistics"=>"pickup", "charged_amounts_attributes"=>[{"amount"=>"40", "type_of_amount"=>"logistics"}], "instructions" => "123 Fake street"}
]
相反,我得到了以下内容:
"type_logistics_attributes"=>[
{"id"=>"1", "type_of_logistics"=>"pickup", "instructions"=>"test instructions", "charged_amounts_attributes"=>[{"amount"=>"40", "type_of_amount"=>"logistics"}]},
{"instructions"=>"123 Fake street"}
]
不知何故,<td>
边界不起作用,子charged_amount
属性以某种方式被集中到第一个<td>
现有记录修改中。
谢谢!
发布于 2016-07-25 21:16:33
据我所知,您可以在一个表单中获得两个参数,但嵌套方式不同的唯一方法是,如果您为新的输入字段提供一些id。这就是区分type_logistics_attributes
数组元素的原因。
我也有类似的需求,于是我使用了ryanb's nested form。当我将它用于与您相同的目的时,它所做的就是为新的输入字段提供一个随机的id。这就是它的区别。
希望这篇文章能把你引向正确的方向。
发布于 2016-06-15 16:37:51
我不确定有没有一种方法可以按照你想要的那样做,但你可以让params看起来像这样:
"type_logistics_attributes"=>[
{"id"=>"1", "instructions"=>"test instructions"},
{"id"=>"1", "type_of_logistics"=>"pickup", "charged_amounts_attributes"=>[{"amount"=>"40", "type_of_amount"=>"logistics"}], "instructions" => "123 Fake street"}
]
你可以通过在这里添加额外的隐藏输入重复id来实现:
<td width="50%" style="padding-right:3%" class="logistic-details" data-type="logistics" data-typelogistics="pickup" data-instructions="" data-id="" data-amount="0">
<span class="area-to-inject-amount-inputs" data-object="type_logistics" data-type="logistics" data-typelogistics="pickup" data-actioned="charged">
<input name="type_logistics_attributes[][id]" type="hidden" value="1">
<input type="hidden" name="type_logistics_attributes[][type_of_logistics]" value="pickup">
<input class="injected-amount-input" type="number" min="0" max="" placeholder="Amount" name="type_logistics_attributes[][charged_amounts_attributes][][amount]" value="20">
<span class="area-to-inject-type-of-amount">
<input type="hidden" name="type_logistics_attributes[][charged_amounts_attributes][][type_of_amount]" value="logistics">
</span>
<input class="labeler-response" name="type_logistics_attributes[][instructions]" type="text" placeholder="Enter address and instructions">
</span>
</td>
Rails有一个处理这个问题的规则:它在查询字符串中从左到右获取属性(或者在HTML中从上到下),并在每次看到重复的属性时创建一个新对象。
https://stackoverflow.com/questions/37624829
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