我正在尝试为以前的帖子找到解决方案:Mongo gives duplicate key error on _id_ field in Meteor application
为了做到这一点,我想从服务器端的CSV文件中读取数据,而不是从客户端读取数据。
首先我尝试了这篇文章Using node-csv and meteor-file to import CSV into a collection中的解决方案,但流星文件不再与当前版本的Meteor兼容。我也尝试过这篇文章Upload Data to Meteor / Mongo DB中的解决方案,但它也在客户端上,该解决方案会产生与我之前的帖子相同的错误。
经过一些进一步的研究后,我尝试用下面的代码读取数据。然而,它不起作用:
首先我创建了一个集合:
Meteor.orders = new Meteor.Collection('Orders');
我定义了以下模板来读取csv文件:
<template name="read_file_orders">
<form class="well form-inline">
<label class="control-label" for="fileInput2">Kies bestand</label>
<input class="input-file" id="fileInput2" type="file" name="files[]">
<Button class="btn btn-primary" id="read_orders">Importeer</button>
<button class="btn btn-danger" id="erase_orders">Wis gegevens</button>
</form>
</template>
这是客户端javascript:
Template.read_file_orders.events({
"click #read_orders" : function(e) {
var f = document.getElementById('fileInput2').files[0];
console.log("read file");
readFile(f, function(content) {
Meteor.call('upload',content);
});
}
});
readFile = function(f,onLoadCallback) {
var reader = new FileReader();
reader.onload = function (e){
var contents=e.target.result
onLoadCallback(contents);
}
reader.readAsText(f);
};
这是服务器javascript:
Meteor.startup(function () {
// code to run on server at startup
return Meteor.methods({
upload : function(fileContent) {
console.log("start insert");
import_file_orders(fileContent);
console.log("completed");
}
});
});
import_file_orders = function(file) {
var lines = file.split('%\r\n');
var l = lines.length - 1;
for (var i=0; i < l; i++) {
var line = lines[i];
var line_parts = line.split('|');
var ex_key = line_parts[0];
var ex_name = line_parts[1];
var clin_info = line_parts[2];
var order_info = line_parts[3];
var clinician_last_name = line_parts[4];
var clinician_first_name = line_parts[5];
var clinician_code = line_parts[6];
var clinician_riziv = line_parts[7]
var pat_id = line_parts[8];
Meteor.orders.insert({Patient:pat_id, Exam_code:ex_key, Exam_name:ex_name, Clinical_info:clin_info, Order_info:order_info, Clinician_first:clinician_first_name, Clinician_last:clinician_last_name, Clinician_c_code:clinician_code, Clinician_riziv:clinician_riziv, Planned:null});
console.log("%");
};
当我尝试阅读文件时,没有任何反应。只有控制台日志出现在服务器控制台中,但没有导入任何内容。即使订单集合也没有创建。
很明显,我做错了什么,但我不知道到底是什么。但是我认为解决方案并不是太过分。也许有人可以告诉我正确的方向?亲切的问候
编辑:
为了回答这里的答案,我的testapp的完整代码是:
的test.html:
<head>
<title>test</title>
</head>
<body>
<h1>Welcome to Meteor!</h1>
{{> read_file_orders}}
</body>
<template name="read_file_orders">
<form class="well form-inline">
<label class="control-label" for="fileInput2">Kies bestand</label>
<input class="input-file" id="fileInput2" type="file" name="files[]">
<Button class="btn btn-primary" id="read_orders">Importeer</button>
<button class="btn btn-danger" id="erase_orders">Wis gegevens</button>
</form>
</template>
test.js
Orders = new Mongo.Collection("orders");
if (Meteor.isClient) {
// counter starts at 0
Template.read_file_orders.events({
"click #read_orders" : function(e) {
var f = document.getElementById('fileInput2').files[0];
console.log("read file");
readFile(f, function(content) {
Meteor.call('upload',content);
});
}
});
import_file_orders = function(file) {
console.log("enter function import_file_orders")
var lines = file.split(/\r\n|\n/);
var l = lines.length - 1;
for (var i=0; i < l; i++) {
var line = lines[i];
var line_parts = line.split(',');
var ex_key = line_parts[0];
var ex_name = line_parts[1];
var clin_info = line_parts[2];
var order_info = line_parts[3];
var clinician_last_name = line_parts[4];
var clinician_first_name = line_parts[5];
var clinician_code = line_parts[6];
var clinician_riziv = line_parts[7]
var pat_id = line_parts[8];
var result = Orders.insert({Patient:pat_id, Exam_code:ex_key, Exam_name:ex_name, Clinical_info:clin_info, Order_info:order_info, Clinician:{first:clinician_first_name, last:clinician_last_name, c_code:clinician_code, riziv:clinician_riziv}, Planned:null});
console.log(Orders.findOne(result));
};
}
readFile = function(f,onLoadCallback) {
//When the file is loaded the callback is called with the contents as a string
var reader = new FileReader();
reader.onload = function (e){
var contents=e.target.result
onLoadCallback(contents);
}
reader.readAsText(f);
};
}
if (Meteor.isServer) {
Meteor.startup(function () {
// code to run on server at startup
});
Meteor.methods({
upload : function(fileContent) {
console.log("start insert");
import_file_orders(fileContent);
console.log("completed");
}
});
}
答案 0 :(得分:6)
你非常接近。我只需做一些改动就能让它发挥作用。
我不知道你的.csv文件是什么样的,所以我做了一个像这样的:
A1, B1, C1, D1, E1, F1, G1, H1, I1
A2, B2, C2, D2, E2, F2, G2, H2, I2
你的file.split操作没有分割线,但是把所有东西放在一个大线上。我是这样做的,它起作用了:
var lines = file.split(/\r\n|\n/);
将各个行拆分为数组成员。然后我假设,因为您将输入称为CSV,所以您的值用逗号分隔,而不是用管道分隔。所以我把你的line.split改成了这个
var line_parts = line.split(',');
我所做的其他改变可能不是导致你失败的原因,但这就是我认为通常会做的事情......
而不是像这样宣布你的收藏
Meteor.orders = new Meteor.Collection('Orders');
我这样做了
Orders = new Mongo.Collection("orders");
请注意,这由服务器和客户端运行。
而不是在服务器上声明方法的方式,我只是把它放到服务器代码中(不在Meteor.start中):
Meteor.methods({
upload : function(fileContent) {
console.log("start insert");
import_file_orders(fileContent);
console.log("completed");
}
});
当然,我更改了import_file_orders函数底部的插入行
var result = Orders.insert({Patient:pat_id, Exam_code:ex_key, Exam_name:ex_name, Clinical_info:clin_info, Order_info:order_info, Clinician_first:clinician_first_name, Clinician_last:clinician_last_name, Clinician_c_code:clinician_code, Clinician_riziv:clinician_riziv, Planned:null});
console.log(Orders.findOne(result));
编辑问题中的更新代码:
将import_file_orders函数从客户端块移动到服务器块。