如何使用Rails中的现有数据预填充嵌套字段?
问题描述:
我有许多成分的收据模型。所以,我用如何使用Rails中的现有数据预填充嵌套字段?
gem "nested_form"
gem "cocoon"
嵌套形式。一切都很好,同时创造一种新的成分(或几种成分)。但是我想在编辑时用现有数据预先填充这些字段。
_form.html.slim
= f.fields_for :ingredients, [@receipt.ingredients.build] do |i|
= render 'ingredient_fields', f: i
= link_to_add_association 'Add ingredient', f, :ingredients, class: "btn btn-success"
br/
_ingredient_fields.html.slim
.nested-fields
.row
.form-group.col-xs-5
.field
= f.text_field :name, placeholder: "Name", class: "form-control"
.form-group.col-xs-3
.field
= f.number_field :count, placeholder: "Count", class: "form-control"
.form-group.col-xs-3
.field
= f.select :count_name, [['gr', 'gr'], ['kg', 'kg']], placeholder: "count name", class: "form-control"
= link_to_remove_association image_tag("/close.png"), f
这是收据控制器的一部分
def edit
@ingredients = @receipt.ingredients
end
答
在你的表格你应该写:
= f.fields_for :ingredients do |i|
这将迭代现有的收据成分。如果你仍然想在默认情况下添加新的成分创建一个新的收据时,你可以做到这一点最简单的为您的receipts_controller
如下:
def new
@receipt = Receipt.new
@receipt.ingredients.build
end
你可以发布你的ingredients_controller?您通常会在编辑操作中执行'@ingredient = Ingredient.find(params [:id])''。这将找到与编辑的ID – ThorTL67
@ ThorTL67相关的所有成分和成分字段,但它是收据控制器。 –