Rails表单提交嵌套字段两次

Question

我有一个名为@miniset的模型

它通过@size模型接受@scale的嵌套属性，其形式为new.html.erb

这一切都很好，直到最近它开始两次提交嵌套信息。

它为它创建了一个@miniset和一个@size，但随后它创建了另一个具有相同信息但缺少:scale_id的@size。

我环顾四周，完全不知道它为什么开始这么做。

我真的不知道该在这里包含哪些代码。

这是日志：

Parameters: {"utf8"=>"✓", "authenticity_token"=>"FpDJeyhp8Qb17v6H6EF+ZXi0562cyNv6oV+yl/HrT8I=", "miniset"=>{"name"=>"Test please work", "quantity"=>"4", "material"=>"Hard Plastic", "sizes_attributes"=>{"0"=>{"scale_id"=>"1"}}, "pcode"=>"", "release_date(1i)"=>"", "release_date(2i)"=>"", "release_date(3i)"=>"", "notes"=>""}, "Set Scale"=>{"#<ActiveRecord::Associations::CollectionProxy::ActiveRecord_Associations_CollectionProxy_Size:0x007ff9a9cd8728>"=>""}, "commit"=>"Add set"}
User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."remember_token" = 'd59f28d384d62b71719dd845b4e5353cdd993016' LIMIT 1
(0.3ms)  begin transaction
SQL (5.6ms)  INSERT INTO "minisets" ("created_at", "material", "name", "notes", "pcode", "quantity", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?)  [["created_at", Mon, 27 Jan 2014 20:10:49 UTC +00:00], ["material", "Hard Plastic"], ["name", "Test Please Work"], ["notes", ""], ["pcode", ""], ["quantity", 4], ["updated_at", Mon, 27 Jan 2014 20:10:49 UTC +00:00]]
SQL (0.8ms)  INSERT INTO "sizes" ("created_at", "miniset_id", "scale_id", "updated_at") VALUES (?, ?, ?, ?)  [["created_at", Mon, 27 Jan 2014 20:10:49 UTC +00:00], ["miniset_id", 8], ["scale_id", 1], ["updated_at", Mon, 27 Jan 2014 20:10:49 UTC +00:00]]
SQL (0.4ms)  INSERT INTO "sizes" ("created_at", "miniset_id", "updated_at") VALUES (?, ?, ?)  [["created_at", Mon, 27 Jan 2014 20:10:49 UTC +00:00], ["miniset_id", 8], ["updated_at", Mon, 27 Jan 2014 20:10:49 UTC +00:00]]

这是表单中处理大小/比例的部分：

<%= f.fields_for :sizes do |size_fields| %>
<%= size_fields.label :scale_id, simple_pluralize(@miniset.scales.count, 'Scale') %>
<%= hidden_field "Set Scale", @miniset.sizes %>
<div class = "form-inline"><%= size_fields.select :scale_id, options_from_collection_for_select(Scale.all, :id, :name, {:selected => @miniset.scales.map(&:id)}) %>
<% end %></div>

在我的脑海中_控制器我有

def create
@miniset = Miniset.new(miniset_params)
@size = @miniset.sizes.build
if @miniset.save
redirect_to @miniset
else
render 'new'
end

下面我有mini set_params

def miniset_params
params.require(:miniset).permit(:name, :release_date, :material, :pcode, :notes, :quantity, sizes_attributes: [:id, :scale_id, :miniset_id])
end

如果你认为你可以帮助隔离问题，但需要其他代码，请告诉我，我会编辑它。呃。

Answer 1

问题是，在保存之前，您要从Form AND设置sizes_attributes，然后在Controller中构建另一个Size子级。

您会注意到保存的第二个大小缺少"scale_id"，因此它与Form.中的大小不同

def create
@miniset = Miniset.new(miniset_params) # Miniset AND Size initialized from params
@size = @miniset.sizes.build # ANOTHER Size initialized, remove this line
if @miniset.save
redirect_to @miniset
else
render 'new'
end
end

问题是：@size = @miniset.sizes.build，这是不必要的，因为您正在通过nested_attributes创建子项。