For-Each-Loop through mongoDB collection with javascript
0
I'm working on a little mongoDB project.
I've got 2 collections:
- studentsList
- studentsPresence
I want to check if there is are documents for a student in studentsPresence. If not it should initialize the studentsPresence. Therefor I got this function:
// Check if there is a document for the presence for each student
function initializePresenceList () {
const date = getDate();
const match = PresenceDB.find({date: date}).fetch();
if(match[0] == null) {
const listStudents = ListDB.find();
for (let student of listStudents) {
alert('Check');
PresenceDB.insert({
_id: student._id,
beaconID: student.beaconID,
firstName: student.firstName,
lastName: student.lastName,
block1: false,
block2: false,
block3: false,
block4: false,
date: date
});
}
}
}
The alert('check'); is not executed. So the for part is not being executed.
javascript mongodb collections
asked yesterday
JubJub
15
add a comment |
0
I'm working on a little mongoDB project.
I've got 2 collections:
- studentsList
- studentsPresence
I want to check if there is are documents for a student in studentsPresence. If not it should initialize the studentsPresence. Therefor I got this function:
// Check if there is a document for the presence for each student
function initializePresenceList () {
const date = getDate();
const match = PresenceDB.find({date: date}).fetch();
if(match[0] == null) {
const listStudents = ListDB.find();
for (let student of listStudents) {
alert('Check');
PresenceDB.insert({
_id: student._id,
beaconID: student.beaconID,
firstName: student.firstName,
lastName: student.lastName,
block1: false,
block2: false,
block3: false,
block4: false,
date: date
});
}
}
}
The alert('check'); is not executed. So the for part is not being executed.
javascript mongodb collections
asked yesterday
JubJub
15
I suspectListDB.find()returns undefined or empty. Please tryconsole.log(listStudents)before the for-loop to see the value inside the variable.
– holydragon
yesterday
Are you using any ORM like mongoose or are you using the native drivers?
– JLeggatt
yesterday
I'm running mongoDB as a service combined with meteor. I'm not sure how to runconsole.log(listStudents). I do all the testing in a web browser. I got mongoDB installed in the default way to run as a service and using Compass to interact with it in a GUI.
– Jub
yesterday
add a comment |
0
0
0
I'm working on a little mongoDB project.
I've got 2 collections:
- studentsList
- studentsPresence
I want to check if there is are documents for a student in studentsPresence. If not it should initialize the studentsPresence. Therefor I got this function:
// Check if there is a document for the presence for each student
function initializePresenceList () {
const date = getDate();
const match = PresenceDB.find({date: date}).fetch();
if(match[0] == null) {
const listStudents = ListDB.find();
for (let student of listStudents) {
alert('Check');
PresenceDB.insert({
_id: student._id,
beaconID: student.beaconID,
firstName: student.firstName,
lastName: student.lastName,
block1: false,
block2: false,
block3: false,
block4: false,
date: date
});
}
}
}
The alert('check'); is not executed. So the for part is not being executed.
javascript mongodb collections
asked yesterday
JubJub
15
I'm working on a little mongoDB project.
I've got 2 collections:
- studentsList
- studentsPresence
I want to check if there is are documents for a student in studentsPresence. If not it should initialize the studentsPresence. Therefor I got this function:
// Check if there is a document for the presence for each student
function initializePresenceList () {
const date = getDate();
const match = PresenceDB.find({date: date}).fetch();
if(match[0] == null) {
const listStudents = ListDB.find();
for (let student of listStudents) {
alert('Check');
PresenceDB.insert({
_id: student._id,
beaconID: student.beaconID,
firstName: student.firstName,
lastName: student.lastName,
block1: false,
block2: false,
block3: false,
block4: false,
date: date
});
}
}
}
The alert('check'); is not executed. So the for part is not being executed.
javascript mongodb collections
javascript mongodb collections
asked yesterday
JubJub
15
asked yesterday
JubJub
15
asked yesterday
JubJub
15
asked yesterday
JubJub
15
asked yesterday
JubJub
15
15
I suspectListDB.find()returns undefined or empty. Please tryconsole.log(listStudents)before the for-loop to see the value inside the variable.
– holydragon
yesterday
Are you using any ORM like mongoose or are you using the native drivers?
– JLeggatt
yesterday
I'm running mongoDB as a service combined with meteor. I'm not sure how to runconsole.log(listStudents). I do all the testing in a web browser. I got mongoDB installed in the default way to run as a service and using Compass to interact with it in a GUI.
– Jub
yesterday
add a comment |
I suspectListDB.find()returns undefined or empty. Please tryconsole.log(listStudents)before the for-loop to see the value inside the variable.
– holydragon
yesterday
Are you using any ORM like mongoose or are you using the native drivers?
– JLeggatt
yesterday
I'm running mongoDB as a service combined with meteor. I'm not sure how to runconsole.log(listStudents). I do all the testing in a web browser. I got mongoDB installed in the default way to run as a service and using Compass to interact with it in a GUI.
– Jub
yesterday
I suspect
ListDB.find() returns undefined or empty. Please try console.log(listStudents) before the for-loop to see the value inside the variable.– holydragon
yesterday
I suspect
ListDB.find() returns undefined or empty. Please try console.log(listStudents) before the for-loop to see the value inside the variable.– holydragon
yesterday
Are you using any ORM like mongoose or are you using the native drivers?
– JLeggatt
yesterday
Are you using any ORM like mongoose or are you using the native drivers?
– JLeggatt
yesterday
I'm running mongoDB as a service combined with meteor. I'm not sure how to run
console.log(listStudents). I do all the testing in a web browser. I got mongoDB installed in the default way to run as a service and using Compass to interact with it in a GUI.– Jub
yesterday
I'm running mongoDB as a service combined with meteor. I'm not sure how to run
console.log(listStudents). I do all the testing in a web browser. I got mongoDB installed in the default way to run as a service and using Compass to interact with it in a GUI.– Jub
yesterday
add a comment |
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I suspect
ListDB.find()returns undefined or empty. Please tryconsole.log(listStudents)before the for-loop to see the value inside the variable.– holydragon
yesterday
Are you using any ORM like mongoose or are you using the native drivers?
– JLeggatt
yesterday
I'm running mongoDB as a service combined with meteor. I'm not sure how to run
console.log(listStudents). I do all the testing in a web browser. I got mongoDB installed in the default way to run as a service and using Compass to interact with it in a GUI.– Jub
yesterday