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[英]Iterate through mongo cursor to list all values in Meteor Blaze?
[英]Export table values Meteor Blaze
我在将表导出到流星/火焰中的csv时遇到了一些困难。 我正在关注:[ http://rafaelquintanilha.com/export-your-json-data-to-csv-format/] [1 ] 。
我有一个触发导出按钮的Template.event
Template.export.onCreated( () => {
Template.instance().subscribe('table');
});
Template.export.helpers({
exportContacts() {
return Contacts.find();
}
});
Template.export.events({
'click .export-data' () {
MyAppExporter.exportAllContacts();
}
});
它正在全局助手中调用exportAllContacts()
MyAppExporter = {
exportAllContacts: function() {
var self = this;
Meteor.call("exportContacts", function(error, data) {
if ( error ) {
alert(error);
return false;
}
var csv = Papa.unparse(data);
self._downloadCSV(csv);
});
},
_downloadCSV: function(csv) {
var blob = new Blob([csv]);
var a = window.document.createElement("a");
a.href = window.URL.createObjectURL(blob, {type: "text/plain"});
a.download = "contacts.csv";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
}
}
并且助手正在调用Meteor.method exportContacts
Meteor.methods({
exportContacts: function() {
let fields = [
"Email",
“Some Contact",
"Created Date",
"Hard Bounce",
"Unsubscribed"
];
let data = [];
let contacts = Contacts.find().fetch();
for(let i = 0; i < contacts.length; i++) {
let contact = contacts[i];
let contactString = JSON.stringify(contact);
_.each(contactString, function(c) {
console.log("Inside Loop", contactString);
data.push([
c.contact.emailAddress,
c.contact.someContact,
c.contact.creationDate,
c.contact.hardBounceBack,
c.contact.unsubscribed
]);
console.log("DATA", data)
return {fields: fields, data: data};
});
}
}
});
我不断收到错误消息,“未定义emailAddress” exportContacts.js:20:17
20160426-22:00:47.957(-4)? Inside Loop {"_id":"dRnXRdZrbR9CYdmBx","contact":[{"emailAddress":"fred@weasly.com","someContact":"No","creationDate":"N/A","hardBounceBack":"N/A","unsubscribed":"N/A"}]}
I20160426-22:00:48.029(-4)? Exception while invoking method 'exportContacts' ReferenceError: emailAddress is not defined
I20160426-22:00:48.029(-4)? at server/methods/exportContacts.js:20:17
I20160426-22:00:48.029(-4)? at Function._.each._.forEach (packages/underscore.js:142:22)
I20160426-22:00:48.029(-4)? at _loop (server/methods/exportContacts.js:17:7)
但我似乎无法弄清楚如何访问联系人。 我将其注销(请参阅上面的日志)。 任何帮助,将不胜感激。
添加日志让contact = Contacts.find()。fetch(); console.log(联系人)
I20160427-09:06:23.484(-4)? CONTACTS [ { _id: 'dRnXRdZrbR9CYdmBx', contact: [ [Object] ] },
I20160427-09:06:23.484(-4)? { _id: 'LHmW4R9PLM5D7cZxr', contact: [ [Object] ] },
I20160427-09:06:23.484(-4)? { _id: 'jBdqQXz2b8itXJowX', contact: [ [Object] ] },
I20160427-09:06:23.484(-4)? { _id: 'bnDvNGX3i879z4wr2', contact: [ [Object] ] } ]
c.contact [0] .email地址已注销
I20160427-09:22:08.142(-4)? Inside Loop {"_id":"dRnXRdZrbR9CYdmBx","contact":[{"emailAddress":"fred@weasly.com","someContact":"No","creationDate":"N/A","hardBounceBack":"N/A","unsubscribed":"N/A"}]}
I20160427-09:22:08.217(-4)? Exception while invoking method 'exportContacts' TypeError: Cannot read property '0' of undefined
I20160427-09:22:08.217(-4)? at server/methods/exportContacts.js:21:7
I20160427-09:22:08.217(-4)? at Function._.each._.forEach (packages/underscore.js:142:22)
I20160427-09:22:08.217(-4)? at _loop (server/methods/exportContacts.js:18:7)
I20160427-09:22:08.218(-4)? at [object Object].exportContacts (server/methods/exportContacts.js:15:46)
您的问题是这一行: _.each(contactString, function(c) {
它应显示为: _.each(contact, function(c) {
:)
在_.each循环中,您正在访问错误的数据项。 您也可以使用_.each循环而不是外部for循环。 如果您这样做:
let contacts = Contacts.find().fetch();
_.each(contacts, function(contact) {
_each(contact.contact, function(c) {
data.push(
{
"email": c.emailAddress,
"contact": c. someContact,
"creationDate" : c.creationDate,
"bounceBack": c.hardBounceBack,
"unsubscribed": c.unsubscribed
}
})
})
这应该可以解决您的问题。 这样,您将遍历从访存返回的外部触点,然后遍历每个元素的触点阵列。 这应该是获取所需数据的最直接方法。
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