Mongoid：向模型添加了哈希，但无法写入
我有一个模型，实体。
class Entity
include Mongoid::Document
field :x
field :y
field :z, type => Hash, :default => {} # new field
end
我向其中添加了一个新字段，即哈希值。当我尝试使用它时，出现错误。我的代码是：
e = Entity.first
if e.z["a"] # if there is a key of this in it?
e.z["a"] = e.z["a"] + 1
else
e.z["a"] = 1
end
但是，这个错误与未定义的方法获取哈希有关。如果我尝试为其创建一个初始值设定项，以在现有文档中设置值，则会出现相同的错误。我做错了什么？
初始化器看起来像：
e = Entity.first
e.write_attribute(:z, {})
谢谢
I've got a model, Entity.
class Entity
include Mongoid::Document
field :x
field :y
field :z, type => Hash, :default => {} # new field
end
I added a new field to it, a hash. When I try to use it, I get an error. My code is:
e = Entity.first
if e.z["a"] # if there is a key of this in it?
e.z["a"] = e.z["a"] + 1
else
e.z["a"] = 1
end
But, this error with an undefined method get for hash. If I try to create an initializer for it, to set the values in an existing document, it errors with the same error. What am I doing wrong?
Initializer looks like:
e = Entity.first
e.write_attribute(:z, {})
Thanks
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排序了。
看来答案是在 Mongoid 1.9.5 中将哈希设置为：
并且它可以访问并初始化它。不太明白为什么，但很高兴得到答案！
Sorted it.
It seems the answer is to set in Mongoid 1.9.5 the hash to:
and it can access and initialize it. Not quite understanding why, but happy to have the answer !