是否可以使用集合多态简化此代码？

Question

我必须有不同的集合、字符和灵魂，它们共享许多相同的属性，并在相同的上下文中使用。这意味着每次我想对这些集合进行读/写时，我都必须执行“类型检查”，然后按下面所示复制代码两次。有什么办法可以实现

Polymorphic.update()..

而不是

(Pseudocode)
if target.is(Character)
  same logic..
  Character.update(same query/fields)..
else
  same logic..
  Soul.update(same query/fields)..

完整代码如下

  #
  # Adds a new condition instance to target
  #
  addCondition: (effect, target) ->

    name        = effect.name
    maxDuration = effect.maxDuration
    curDuration = if effect.curDuration then effect.curDuration else maxDuration
    maxStack    = effect.maxStack
    curStack    = if effect.curStack then effect.curStack else 1
    stackable   = if maxStack then true else false

    if target.location  <--- This is my type check, only the Character collection has a location field

      character = Characters.findOne({_id: target._id, 'conditions.name': name}, { fields: {'conditions.$': 1} })
      if character then existingCondition = character.conditions[0]

      if existingCondition and stackable

        # Apply additional stack and refresh duration
        if existingCondition.curStack < existingCondition.maxStack
          Characters.update({ _id: target._id, 'conditions.name': name }, { $inc: { 'conditions.$.curStack': 1 }, $set: { 'conditions.$.curDuration': maxDuration } })

        else
          Characters.update({ _id: target._id, 'conditions.name': name }, { $set: { 'conditions.$.curDuration': maxDuration } })

      else if existingCondition and !stackable
        Characters.update({ _id: target._id, 'conditions.name': name }, { $set: { 'conditions.$.curDuration': maxDuration } })

      else
        effect = _.extend(effect, {curDuration: curDuration, curStack: curStack})
        Characters.update(_id: target._id, {$addToSet: { conditions: effect }})

    else
      soul = Souls.findOne({_id: target._id, 'conditions.name': name}, { fields: {'conditions.$': 1} })
      if soul then existingCondition = soul.conditions[0]

      if existingCondition and stackable

        # Apply additional stack and refresh duration
        if existingCondition.curStack < existingCondition.maxStack
          Souls.update({ _id: target._id, 'conditions.name': name }, { $inc: { 'conditions.$.curStack': 1 }, $set: { 'conditions.$.curDuration': maxDuration } })

        else
          Souls.update({ _id: target._id, 'conditions.name': name }, { $set: { 'conditions.$.curDuration': maxDuration } })

      else if existingCondition and !stackable
        Souls.update({ _id: target._id, 'conditions.name': name }, { $set: { 'conditions.$.curDuration': maxDuration } })

      else
        effect = _.extend(effect, {curDuration: curDuration, curStack: curStack})
        Souls.update(_id: target._id, {$addToSet: { conditions: effect }})

Answer 1

只需在文档中添加一个type (/class/collection)字段：

Character.prototype.type = ->
  Character

Soul.prototype.type = ->
  Soul

...
target.type.update ...