如何从MongoDB打印所有键和值? [英] How to print all keys and values from MongoDB?

问题描述

例如，我在一个集合中有以下记录:

I have for instance following records in a collection:

{ "_id" : ObjectId("4f0224ad6f85ce027e000031"), "monday" : "7am" }
{ "_id" : ObjectId("4f0224ad6f85ce027e00002e"), "tuesday" : "11.40am" }
{ "_id" : ObjectId("4f0224ad6f85ce027e000025"), "wednestay" : "12am", 
                                                "thursday" : "1pm" }

在控制器中，我将抓取所有项目，并在视图中将其打印为以下形状:

In the controller I will grab all items and in the view I would like to print them in the shape:

monday 7am
tuesday 11.40am
wednesday 12am  thursday 1pm

我的应用程序在Rails上运行.存在任何快速&优雅的方式吗?谢谢！

My app is running on Rails. Exist any quick & elegant way to do it? Thanks!

编辑 这对我有效:

records = collection.where('something' => variable)

records.each do |rec|
  puts rec._id
end

不是

records = collection.where('something' => variable)

records.each do |rec|
  rec.each do |k, v| #here is the error "undefined each"
    next if k == '_id' # skip the _id field
    puts "#{k} #{v}"
  end
end

推荐答案

您基本上不需要执行任何操作.只需加载所有记录，遍历它们，然后打印即可.

You basically don't have to do anything. Just load all records, loop through them, and print.

records = collection.find()

records.each do |rec|
  rec.attributes.each do |k, v|
    next if k == '_id' # skip the _id field
    puts "#{k} #{v}"
  end
end

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