我与工作的样子像这样的模式:Rails 3中嵌套表单无法创建
class ComplexAssertion < ActiveRecord::Base
has_many :expression_groups
has_many :expressions, :through => :expression_group
accepts_nested_attributes_for :expression_groups, :allow_destroy=>true
end
class ExpressionGroup < ActiveRecord::Base
belongs_to :complex_assertion
has_many :expressions
accepts_nested_attributes_for :expressions, :allow_destroy=>true
end
class Expression < ActiveRecord::Base
belongs_to :expression_group
end
我的形式如下所示:
<%= form_for(@complex_assertion) do |f| %>
<div id="mainAssertionGroup" style="border:1px; border-style:solid; width:1000px; padding:5px">
<div class="field">
<%= f.label :title %>: <%= f.text_field :title, :size=>'10' %>
<%= f.label :description %>: <%= f.text_field :description, :size=>'25' %>
<%= f.label :scope %>: <%= f.text_field :scope, :size=>'1' %>
Test
Category: <%= collection_select(:complex_assertion, :assertion_category_id, AssertionCategory.all, :id, :name, {:include_blank=>"UNCATEGORIZED"}) %>
</div>
<div id="initialGroup" style="border:1px; margin-left:10px; margin-top:10px; border-style:solid; width:850px;">
<div class="childGroup1" style="padding:5px;">
<%= f.fields_for :expression_groups do |eg| %>
<%= eg.fields_for :expressions do |e| %>
Type: <%= e.collection_select :assertion_type_id, AssertionType.all, :id, :name %>
Attribute: <%= e.collection_select :attribute_name, Attribute.find_by_sql("select distinct a.name from attributes a "), :name, :name %>
<%= e.label :operator_type_id %>
: <%= e.collection_select :operator_type_id, OperatorType.all, :id, :value %>
Value: <%= e.text_field :value, :size=>'1' %>
<% end %>
<div id="innerOperator">
<%= eg.collection_select :logical_operator_type_id, LogicalOperatorType.all, :id, :value %>
</div>
<% end %>
</div>
</div>
</div>
<div id="createComplex" align="center">
<%= f.submit :value=>'Submit' %>
</div>
<% end %>
而且我的控制器看起来像:
def new_complex_assertion
@complex_assertion = ComplexAssertion.new
end
当我加载页面时,我只有表单的ComplexAssertion部分,并且没有返回ExpressionGroups或Expres sions。就好像没有任何可用的东西。但是,如果你看到我的控制器,我做了一个ComplexAssertion.new,我虽然会自动创建依赖对象;我认为我不正确?
我正在通过RubyMine进行调试,当我计算ComplexAssertion.new时,我只看到5个属性,仅为该对象定义的五个属性,没有任何关系对象。我做错了什么?
编辑 看起来像如果我做到以下几点:
@complex_assertion = ComplexAssertion.new
@complex_assertion.expression_groups.build
@complex_assertion.expressions.build
而改变我的形式使用:的
<%= f.fields_for :expressions do |e| %>
代替eg.fields_for,它显示的形式。
这不会给我正确的嵌套。我以为我应该能够做到:
@complex_assertion.expression_groups.expressions.build
但它告诉我,表达式是一个未定义的方法。
太棒了!添加完毕后:@ complex_assertion.expression_groups.each循环来实例化表达式对象,一切正常!它写入数据库并且工作得很好!这是第一步,现在我必须让它们变得有活力,但非常感谢你让我渡过了最初的障碍。 – 2011-06-02 17:09:18
@QuazzMoto没问题:-)我记得不久前,我还在为自己挣扎! – brettish 2011-06-02 17:23:10