我有三个模型。父、子、类型和关系。关系是引用父、子和类型的富连接模型。
问题是，虽然创建了一个孩子并创建了关系表，但没有填充关系表中的 parent_id。只有子项和类型是自动填充的。
父.rb
attr_acccessible :relationships_attributes
has_many :relationships
has_many :children, :through => :relationships
has_many :types, :through => :relationships
子.rb
attr_acccessible :relationships_attributes
has_many :relationships
has_many :parents, :through => :relationships
has_many :types, :through => :relationships
accepts_nested_attributes_for :relationships
关系.rb
attr_accessible :parent_id, :child_id, :type_id
belongs_to :parent
belongs_to :child
belongs_to :type
children.controller
def new
@child = Child.new
@child.relationships.build
end
def create
@child = Child.new(params[:child])
if @child.save
redirect_to current_user
else
render "new"
end
end
新的.html.erb
<%= simple_form_for @child do |f| %>
<%= f.input :first_name, :label => 'First Name' %>
<%= f.input :gender, :as => :select, :collection => ['Male', 'Female'] %>
<%= f.association :relation_types, :as => :collection_select %>
<%= f.button :submit, :class => "primary" %>
<% end %>
请帮忙。
谢谢！