Question

我有以下型号：

class Assembly < ActiveRecord::Base
  has_many :manifests
  has_many :parts, :through => :manifests
end

class Manifest < ActiveRecord::Base
  belongs_to :assembly
  belongs_to :part
end

class Part < ActiveRecord::Base
  has_many :manifests
  has_many :assemblies, :through => :manifests
end

manifests包含的位置：

assembly_id
part_id
field1
field2
...

如何使用habtm更新其他字段（field1，field2 ...）？

Answer 1

根据http://guides.rubyonrails.org/association_basics.html#choosing-between-has_many-through-and-has_and_belongs_to_many，您必须使用has_many-through而不是habtm关系（就像您在问题中所做的那样）。然后，您可以简单地使用此代码来设置零件和装配体之间的关系：

#create assembly
ass1 = Assembly.new
ass1.save!

# create part
part_x = Part.new
part_x.save!

# create relationship between assembly and part using the join model Manifest
Manifest.new(assembly: ass1, part: part_x, field1: 1, field2: "test").save!

Rails 3.1，has_many：through，habtm

1 个答案: