Ruby-on-rails rails 中的 create_or_update 方法
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create_or_update method in rails
提问by krunal shah
if ClassName.exists?(["id = ?", self.id])
object = ClassName.find_by_name(self.name)
object.update_attributes!( :street_address => self.street_address,
:city_name => self.city_name,
:name => self.org_unit_name,
:state_prov_id => self.state_prov_id,
:zip_code => self.zip_code)
else
ClassName.create! :street_address => self.street_address,
:city_name => self.city_name,
:federalid => self.federalid,
:name => self.org_unit_name,
:state_prov_id => self.state_prov_id,
:zip_code => self.zip_code
end
I have code like this. I would like to improve it so that it uses a method, something like create_or_update.
我有这样的代码。我想改进它，以便它使用一种方法，例如 create_or_update。
ClassName.create_or_update_by_name(:name => self.name,
:street_address => self.street_address,
:city_name => self.city_name,
:federalid => self.federalid,
:name => self.org_unit_name,
:state_prov_id => self.state_prov_id,
:zip_code => self.zip_code)
If the nameexists in the database then it should update that object otherwise it should create a new object.
如果name存在于数据库中，那么它应该更新该对象，否则它应该创建一个新对象。
Is there is any method that exists that I can do this with?
有没有什么方法可以让我做到这一点？
回答by Ju Nogueira
my_class = ClassName.find_or_initialize_by_name(name)
my_class.update_attributes(
:street_address => self.street_address,
:city_name => self.city_name,
:federalid => self.federalid,
:state_prov_id => self.state_prov_id,
:zip_code => self.zip_code
)
回答by Zach Colon
The checked answer above works well for Rails 3. That said the find_or_initialize_by_attributemethods were deprecated in Rails 4. This is the new way. See Rails4 Deprecation warning for find_or_initialize_by method
上面的检查答案适用于 Rails 3。也就是说find_or_initialize_by_attribute，Rails 4 中不推荐使用这些方法。这是新方法。有关find_or_initialize_by 方法，请参阅Rails4 弃用警告
person = Person.find_or_initialize(name: 'name')
person.update_attributes(other_attrs)
回答by lambdabutz
person = Person.find_by_name(name) || Person.new(:name => name)
person.update_attributes!(:street_address => street_address, :city_name => city_name) #etc etc
