javascript - 是否可以在 Meteor 中一起定义多个模板助手而不是一个一个地定义？

Question

名称为 Services 的集合有多个文档:

{
    serviceTitle: "Unlimited HDR Photography",
    serviceDescription: "Includes unlimited daytime HDR photos and a single trip out to the property. A zip file with the bare JPG files will be emailed to you. No website or virtual tour / panoramas.",
    serviceHTML: "",
    sku: "hdrPhotos",
    price: 100,
    _id: "x5Hq7ybdS3YHmrgsa"
}

{
    serviceTitle: "Twilight Photography",
    serviceDescription: "Photos will be shot 15 minutes prior to sunset for dramatic lighting effects.",
    serviceHTML: "",
    sku: "twilightPhotos",
    price: 100,
    _id: "RLhjHBGicGQKgS4SQ"
}

{
    serviceTitle: "Video Clips",
    serviceDescription: "We will come in with professional video equipment and shoot numerous video clips of the property. The video files will then be uploaded to your Single Property Website provider.",
    serviceHTML: "",
    sku: "videoClips",
    price: 175,
    _id: "uBZSeNWa4zZNMa8z9"
}

假设我想要可以显示每个不同服务的服务描述和价格的助手。

Template.myTemplate.helpers({

  hdrPhotosServiceDescription: function(){ 
    return Services.findOne({"sku": "hdrPhotos"}, { serviceDescription:1, _id:0}).serviceDescription
  },
  hdrPhotosPrice: function(){ 
    return Services.findOne({"sku": "hdrPhotos"}, { price:1, _id:0}).price
  },

  twilightPhotosServiceDescription: function(){ 
    return Services.findOne({"sku": "twilightPhotos"}, { serviceDescription:1, _id:0}).serviceDescription
  },
  twilightPhotosPrice: function(){ 
    return Services.findOne({"sku": "twilightPhotos"}, { price:1, _id:0}).price
  },

  videoClipsServiceDescription: function(){ 
    return Services.findOne({"sku": "videoClips"}, { serviceDescription:1, _id:0}).serviceDescription
  },
  videoClipsPrice: function(){ 
    return Services.findOne({"sku": "videoClips"}, { price:1, _id:0}).price
  }

});

这个例子只展示了三个不同的服务，并且希望每个服务的两个属性都有助手。

{{hdrPhotosServiceDescription}}, {{hdrPhotosPrice}}, {{twilightPhotosServiceDescription}}, {{twilightPhotosPrice}}, {{videoClipsServiceDescription}}, {{videoClipsPrice}}

如果每个服务有 10 个不同的属性，我需要为每个属性提供帮助，而我有 30 个不同的服务，会怎样？这样做需要我编写代​​码并定义 300 个不同的助手。

有没有更简单的方法来做到这一点？此外，由于我网站的结构方式，我不能像 Meteor 手册用于其 Posts 集合的那样使用 #each。

Answer 1

模板助手可以有参数。最简单的方法是:

Template.myTemplate.helpers({
  getField: function(sku, fieldName) {
    var projection = {_id: 0};
    projection[fieldName] = 1;
    return Services.findOne({"sku": sku}, projection)[fieldName];
  }
}

您可以像 {{getField "hdrPhotos""serviceDescription"}} 那样调用该助手。