你會如何在Meteor中找到一個具有價值的動態集合？

Question

鑑於我有3種類型的集合和一個動態值，我將如何根據該動態值指定要搜索的集合？

E.g，

array = [ 
    {id: 'one', type: 'profile'}, 
    {id: 'something', type: 'post'}, 
    {id: 'askjdaksj', type: 'comment'] 
] 

我怎麼會孤立型，使之成爲一個集？基本上將車型變爲Collection.find

array[0].type.find({_id: id}); 
=> Profiles.find({_id: id}); 

這可能嗎？

Answer 1

下面是一個完整的工作示例：

Posts = new Mongo.Collection('posts'); 
Comments = new Mongo.Collection('comments'); 

var capitalize = function(string) { 
    return string.charAt(0).toUpperCase() + string.slice(1); 
}; 

var nameToCollection = function(name) { 
    // pluralize and capitalize name, then find it on the global object 
    // 'post' -> global['Posts'] (server) 
    // 'post' -> window['Posts'] (client) 
    return this[capitalize(name) + 's']; 
}; 

Meteor.startup(function() { 
    // ensure all old documents are removed 
    Posts.remove({}); 
    Comments.remove({}); 

    // insert some new documents 
    var pid = Posts.insert({text: 'I am a post'}); 
    var cid = Comments.insert({text: 'I am a comment'}); 

    var items = [ 
    {id: pid, type: 'post'}, 
    {id: cid, type: 'comment'} 
    ]; 

    _.each(items, function(item) { 
    // find the collection object based on the type (name) 
    var collection = nameToCollection(item.type); 

    // retrieve the document from the dynamically found collection 
    var doc = collection.findOne(item.id); 
    console.log(doc); 
    }); 
}); 

推薦閱讀：collections by reference。