由於缺少集合對象導致Collection2關係錯誤

Question

我正在嘗試創建2個集合之間的關係，但其中一個集合不可用於其他引用。具體來說，我有2個集合：Sites和ContentTypes。這是他們包括：

// app/lib/collections/sites.js  
Sites = new Mongo.Collection('sites'); 

Sites.attachSchema(new SimpleSchema({ 
    name: { 
    type: String, 
    label: "Name", 
    max: 100 
    }, 
    client: { 
    type: String, 
    label: "Client", 
    max: 100 
    }, 
    created: { 
    type: Date, 
    autoValue: function() { 
     if (this.isInsert) { 
     return new Date; 
     } else if (this.isUpsert) { 
     return {$setOnInsert: new Date}; 
     } else { 
     this.unset(); // Prevent user from supplying their own value 
     } 
    } 
    } 
})); 

而這裏的CONTENTTYPES集合：

// app/lib/collections/content_types.js 
ContentTypes = new Mongo.Collection('content_types'); 

ContentTypes.attachSchema(new SimpleSchema({ 
    name: { 
    type: String, 
    label: "Name", 
    max: 100 
    }, 
    machineName: { 
    type: String, 
    label: "Machine Name", 
    max: 100 
    }, 
    site:{ 
    type: Sites 
    }, 
    created: { 
    type: Date, 
    autoValue: function() { 
     if (this.isInsert) { 
     return new Date; 
     } else if (this.isUpsert) { 
     return {$setOnInsert: new Date}; 
     } else { 
     this.unset(); // Prevent user from supplying their own value 
     } 
    } 
    } 
})); 

當我添加的網站參考CONTENTTYPES模式，我的應用程序崩潰與錯誤：

ReferenceError: Sites is not defined at lib/collections/content_types.js:32:11

我還沒有找到很多運氣，找到收藏2中超過this的關係的文檔。它看起來像那裏引用的格式應該基於this thread。

Answer 1

這是由於命令流星加載文件。請參閱文件加載順序部分here：

There are several load ordering rules. They are applied sequentially to all applicable files in the application, in the priority given below:

1. HTML template files are always loaded before everything else
2. Files beginning with main. are loaded last
3. Files inside any lib/ directory are loaded next
4. Files with deeper paths are loaded next
5. Files are then loaded in alphabetical order of the entire path

例如，將app/lib/collections/sites.js重命名爲app/lib/collections/a_sites.js，並在加載content_types.js文件時定義Sites變量。