如何在插入时引用另一个集合？

Question

我正在尝试如何获取Image(使用CollectionFS的文件)并将Image的Id插入到我的Items imageId字段中:

LIB /收藏/ items.js

Items = new Mongo.Collection("items");
Items.attachSchema(new SimpleSchema({
  name: {
    type: String,
    label: "Name",
  },
  userId: {
    type: String,
    regEx: SimpleSchema.RegEx.Id,
    autoform: {
      type: "hidden",
      label: false
    },
    autoValue: function () { return Meteor.userId() },
  },
  image: {
    type: String,
    optional: true,
    autoform: {
      label: false,
      afFieldInput: {
        type: "fileUpload",
        collection: "Images",
        label: 'Select Photo',
      }
    }
  },
  imageId: {
   type: String
  }
}));

LIB /收藏/ images.js

if (Meteor.isServer) {
  var imageStore = new FS.Store.S3("images", {
    accessKeyId: Meteor.settings.AWSAccessKeyId, 
    secretAccessKey: Meteor.settings.AWSSecretAccessKey, 
    bucket: Meteor.settings.AWSBucket, 
  });

  Images = new FS.Collection("Images", {
    stores: [imageStore],
    filter: {
      allow: {
        contentTypes: ['image/*']
      }
    }
  });
}

// On the client just create a generic FS Store as don't have
// access (or want access) to S3 settings on client
if (Meteor.isClient) {
  var imageStore = new FS.Store.S3("images");
  Images = new FS.Collection("Images", {
    stores: [imageStore],
    filter: {
      allow: {
        contentTypes: ['image/*']
      },
    }
  });
}

现在我的允许规则是:

服务器/ allows.js

Items.allow({
  insert: function(userId, doc){return doc && doc.userId === userId;},
  update: function(userId, doc){ return doc && doc.userId === userId;},
  remove: function(userId, doc) { return doc && doc.userId === userId;},
})

Images.allow({
  insert: function(userId, doc) { return true; },
  update: function(userId,doc) { return true; },
  remove: function(userId,doc) { return true; },
  download: function(userId, doc) {return true;},
});

我正在使用Autoform,所以我的表单看起来像这样:

客户机/ item_form.html

<template name="insertItemForm">
  {{#autoForm collection="Items" id="insertItemForm" type="insert"}}
      {{> afQuickField name="name" autocomplete="off"}}
      {{> afQuickField name="image" id="imageFile"}}
      <button type="submit">Continue</button>
  {{/autoForm}}
</template>

现在,当我选择浏览并选择一个图像时,它将存在于数据库中,我想把_id它带到并将其放置在Item之后创建的图像中,但是如何获取该特定图像？我认为这是引用图像的好方法.

更新1

找出文件被选中后实际隐藏的ID:

<input type="hidden" class="js-value" data-schema-key="image" value="ma633fFpKHYewCRm8">

所以我试图让ma633fFpKHYewCRm8被置于一个String在ImageId.

更新2

也许一种方法是使用FS.File Reference？

Answer 1

我已经更简单地解决了同样的问题，插入文件后，我只需调用一个执行相关集合更新的方法：

客户端.html

<template name="hello">
<p>upload file for first texture:   <input id="myFileInput1" type="file"> </p>
</template>

库.js

var textureStore = new FS.Store.GridFS("textures");

TextureFiles = new FS.Collection("textures", {
  stores: [textureStore]
});

Textures = new Mongo.Collection("textures");

客户端.js

Template.hello.events({
        'change #myFileInput1': function(event, template) {
          uploadTextureToDb('first',event);
        }
      });

function uploadTextureToDb(name, event) {
    FS.Utility.eachFile(event, function(file) {
      TextureFiles.insert(file, function (err, fileObj) {
        // Inserted new doc with ID fileObj._id, and kicked off the data upload using HTTP
        console.log('inserted');
        console.log(fileObj);
        //after file itself is inserted, we also update Texture object with reference to this file
        Meteor.call('updateTexture',name,fileObj._id);
      });
    });
  }

服务器.js

  Meteor.methods({
    updateTexture: function(textureName, fileId) {
      Textures.upsert(
        {
          name:textureName
        },
        {
          $set: {
            file: fileId,
            updatedAt: Date.now()
          }
        });
    }
  });

当您使用 autoForm 和 simpleSchema 时，它可能不是那么容易，但我建议您首先忘记 autoForm 和 simpleSchema 并尝试使其与简单的 html 和默认集合一起使用。

一切正常后，您可以返回设置这些内容，但请注意，涉及 CollectionFS 时可能会出现更多问题，尤其是涉及 autoForm 生成的样式时。