不同范围条件下的唯一性验证

Question

class Game

  field :name, type: String
  field :region, type: String
  field :county, type: String
  field :state, type: String
  field :sport, type: String

  # if sport equals football
    validates :name, presence: true, uniqueness: {scope: [:region, :state]}

 # if sport equals baseball
   validates :name, presence: true, uniqueness: {scope: [:county, :state]}

我们如何才能实现特定于一项运动但具有区域&州或县&州范围的名称的唯一性？

Answer 1

可能使用条件：

validates :name, presence: true
validates :name, uniqueness: { scope: [:region, :state] },
                 if: Proc.new { |g| g.sport == 'football' }
validates :name, uniqueness: { scope: [:county, :state] },
                 if: Proc.new { |g| g.sport == 'baseball' }

见Rails Guides: Conditional Validation

Answer 2

您可以使用复合唯一索引在 MongoDB 中强制执行唯一性，如下所示：

db.collection.createIndex( { a: 1, b: 1 }, { unique: true } )

The MongoDB Doc

不同范围条件下的唯一性验证

uniqueness validation on different scope conditions

ruby

mongodb

mongoid