嵌入参考未保存
在mongoid和rails 3下，我有一个用户集合和一个项目集合，其中嵌入了许多关系，模型是：
用户类
包括 Mongoid::文档
字段：名称，：类型=>字符串
Referenced_in：关系，：inverse_of => ：用户
结束类项目
包括 Mongoid::Document
字段：标题，：类型=>字符串
embeds_many :关系
结束类关系
包括 Mongoid::Document
字段：类型，：类型=>字符串
references_one：用户
嵌入_in：主题，：inverse_of => ：关系
结束
是关系的引用用户永远不会保存到关系中。例如，以下命令仅保存 :type：
project1 = Project.new( :title => "project1", :relationships => [ {:type => "master", :user => "4d779568bcd7ac0899000002"} ] )
我的目标是拥有一个项目文档与此类似：
{ "_id" : ObjectId("4d77a8b2bcd7ac08da00000f"), "标题" : "项目1", "关系" : [
{
“类型”：“主控”，
“用户”：ObjectId(“4d775effbcd7ac05a8000002”)，
“_id”：ObjectId(“4d77a8b2bcd7ac08da000010”)
}
] }
:user 从来不存在，我在这里遗漏了什么吗？非常感谢您的帮助！
特德
Under mongoid and rails 3 I have a collection of Users and a collection a Projects which embed many Relationships, the models are:
class User
include Mongoid::Document
field :name, :type => String
referenced_in :relationship, :inverse_of => :user
endclass Project
include Mongoid::Document
field :title, :type => String
embeds_many :relationships
endclass Relationship
include Mongoid::Document
field :type, :type => String
references_one :user
embedded_in :subject, :inverse_of => :relationships
end
My problem is that the referenced user of a relationship is never saved into the relationship. For example for following command only saves :type:
project1 = Project.new( :title => "project1", :relationships => [ {:type => "master", :user => "4d779568bcd7ac0899000002"} ] )
My goal is to have a project document similar to this:
{ "_id" : ObjectId("4d77a8b2bcd7ac08da00000f"), "title" : "project1", "relationships" : [
{
"type" : "master",
"user" : ObjectId("4d775effbcd7ac05a8000002"),
"_id" : ObjectId("4d77a8b2bcd7ac08da000010")
}
] }
The :user is never present, am I missing something here? Thanks a lot for your help!
Ted
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因此，您可能需要更改以下几件事：
1）避免使用字段名称“type”，因为这是单表继承使用的 Rails 魔术列名称。也许将它们更改为user_type和relationship_type。
2) 在 Mongoid 2.0 及更高版本中，您可以使用 Active Model 语法（例如 has_many 和 Belongs_to）来代替引用。 http://mongoid.org/docs/relations/referenced/1-n.html
3) 对于您的创建，不要为 user 分配用户 ID，而是尝试分配用户对象。
或者您可以像这样分配 user_id：
仅供参考，您不必在“referenced_in :relationship, :inverse_of => :user”中指定 inverse_of。只需“referenced_in :relationship”就可以了。
So a couple things you might want to change:
1) Avoid the field name "type" as this is a rails magic column name used by single table inheritance. Maybe change them to user_type and relationship_type.
2) With Mongoid 2.0 and up you can use Active Model syntax like has_many and belongs_to instead of references. http://mongoid.org/docs/relations/referenced/1-n.html
3) For your create, instead of assigning user with a user ID, try assigning a user object.
Or you could assign a user_id like so:
FYI, you don't have to specify the inverse_of in "referenced_in :relationship, :inverse_of => :user". Just "referenced_in :relationship" will do the trick.