Rails - 表单问题

Question

在我的应用中，我有 3 个这样的模型：

class Person
has_many :groups
has_many :group_memberships, :foreign_key => "member_id"
end

class Group_Membership
 belongs_to :member, :class_name => 'Person'
 belongs_to :group
end

class Group
belongs_to :person
has_many :group_memberships
has_many :members, :class_name => "Person", :through => "group_memberships", :foreign_key => "member_id"

我需要在 group#show 页面中创建一个按钮，允许 Person 请求 group_membership。根据上一个问题的建议，我在 Group_Membership 控制器上创建了 def create_membership：

def create_membership
  @group = Group.find params[:id]
  if @group.group_memberships.create( :member_id => params[:member_id])
     redirect_to @group
  else
     render :action => 'show'
  end
end

所以我继续我的表单，在 group#show 视图上，我做了如下：

<%= form_for :group_membership, @group_membership, :url => { :action => "create_membership" } do |f| %>
<%= submit_tag "Create" %>
<% end %>

但每次我单击按钮时，它都会将我重定向到创建新组的表单，而不是 Group_Membership。有什么提示吗？ 提前致谢。

########EDIT##########

好吧，我把我的代码改成了这样：

def create
@person = Person.find(current_person)
@group = Group.find(params[:group_id])
params[:group_membership] = {:member_id => @person.id, :group_id => @group.id}
@group_membership = Group_Membership.create(params[:group_membership])
if @group_membership.save
redirect_to @person
else
redirect_to @person
end
end

我现在的表格是这样的：

<% form_for(:group_membership, :url => group_memberships_path(:member_id => current_person, :group_id => @group.id)) do |f| %> <%= submit_tag "Join!" %>

现在我可以实际创建一个 group_membership 模型，但两个 id 都在数据库列 member_id 和 group_id 中添加为空白。

如果我将@group_membership = Group_Membership.create(params[:group_membership]) 行更改为@group_membership = Group.Group_Membership.create(params[:group_membership])，我可以保存组ID。如果我更改为Person.，也会如此。

Answer 1

只是为了清理一下

def create
  @group_membership = Group_Membership.create(:group => Group.find(params[:group_id]), :member => Person.find(current_person))
  if @group_membership.save
    redirect_to @person
  else
    redirect_to @person
  end
end

这段代码应该可以在 rails 3 中运行我不确定早期版本