I am trying to return only the values in an array. I managed to solve this a few months ago on a different project but I have forgotten how.
Here is my current query and the result.
database.find({todo: {$exists: true}},{projection:{_id: 0}}).toArray((error,data) => {
console.log(data);
res.json(data);
});
[
{
todo: {
id: '30a508fbfb8a51d2784920c2d6b7468c',
text: 'testing',
completed: false
}
},
{
todo: {
id: 'dedf6f6a850f7fef02566de027e74416',
text: 'testing',
completed: false
}
}
]
I would like it to return only the values in the Todo array as seen below. What do I need to add in the projection field to make this happen?
[
{
id: '30a508fbfb8a51d2784920c2d6b7468c',
text: 'testing',
completed: false
},
{
id: 'dedf6f6a850f7fef02566de027e74416',
text: 'testing',
completed: false
}
]
Thank you,
I was able to figure it out. Turns out I was using the wrong function.
If there is anyone looking for this solution you want to use distinct and not projections.
database.distinct('todo', function(err, data) {
console.log(data);
});
This resulted in the following below which is what I was needing.
[
{
id: '30a508fbfb8a51d2784920c2d6b7468c',
text: 'testing',
completed: false
},
{
id: 'dedf6f6a850f7fef02566de027e74416',
text: 'testing',
completed: false
}
]
Thanks,
Related
I'm trying to select an arrayfield inside an array. Following code is inserted in my useStore:
const useStore = create(
persist(set => ({
projectszustand: [
{
id: nanoid(),
name: 'Projekt Final 1',
notes: 'Hier sind ein paar Notizen',
begin: '01/01/2001',
end: '02/01/2001',
icon: 'https://www.skopos.de/wp-content/uploads/2021/04/Element-5.svg',
color: 'blue',
edit: false,
selected: true,
feature: [
{
id: nanoid(),
name: 'Feature Final 1',
begin: '01/01/2001',
end: '02/01/2001',
isChecked: false,
edit: false,
selected: false,
todo: [
{...and so on
So, I'm trying to go with forEach and set all selected fields in the feature array to false:
selectFeature: index => {
set(
produce(draft => {
draft.projectszustand[index].feature.forEach(element => {
element.selected = false;
});
draft.projectszustand[index].feature[index].selected =
!draft.projectszustand[index].feature[index].selected;
})
);
},
This no works. Error message is: TypeError: can't access property "feature", draft.projectszustand[index] is undefined
Has somebody an easy solution for this?
Thanks very much for helping.
Given is following data structure
const list = [
{
title: 'Section One',
data: [
{
title: 'Ay',
},
{
title: 'Bx',
},
{
title: 'By',
},
{
title: 'Cx',
},
],
},
{
title: 'Section Two',
data: [
{
title: 'Ay',
},
{
title: 'Bx',
},
{
title: 'By',
},
{
title: 'Cx',
},
],
},
];
What i want to do ist to filter this list based on title property in the data array of each object.
An example would be to have the list where the title property of the childs starts with "B", so the list will look like that:
const filteredList = [
{
title: 'Section One',
data: [
{
title: 'Bx',
},
{
title: 'By',
}
],
},
{
title: 'Section Two',
data: [
{
title: 'Bx',
},
{
title: 'By',
}
],
},
];
What i tried so far was something like that:
const items = list.filter(item =>
item.data.find(x => x.title.startsWith('A')),
);
or
const filtered = list.filter(childList => {
childList.data.filter(item => {
if (item.title.startsWith('B')) {
return item;
}
return childList;
});
});
But i think i am missing a major point here, maybe some of you could give me a tip or hint what i am doing wrong
Best regards
Your issue is that you're doing .filter() on list. This will either keep or remove your objects in list. However, in your case, you want to keep all objects in list and instead map them to a new object. To do this you can use .map(). This way you can map your objects in your list array to new objects which contain filtered data arrays. Here's an example of how you might do it:
const list=[{title:"Section One",data:[{title:"Ay"},{title:"Bx"},{title:"By"},{title:"Cx"}]},{title:"Section Two",data:[{title:"Ay"},{title:"Bx"},{title:"By"},{title:"Cx"}]}];
const filterByTitle = (search, arr) =>
arr.map(
({data, ...rest}) => ({
...rest,
data: data.filter(({title}) => title.startsWith(search))
})
);
console.log(filterByTitle('B', list));
Here is a relevant part of my Schema, where I'll make reservations to a "space":
var spaceSchema = new mongoose.Schema({
spaceName: String,
scheduledDates: [{
scheduledDates: String,
author: {
id: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
username: String
}
}]
});
Author should be the current user that's logged in. Here is my route to update those fields:
router.put('/:space_id/schedule', function(req, res) {
Space.findByIdAndUpdate(req.params.space_id, {
'$push': { 'scheduledDates': req.body.space, 'author': req.user._id }
}, { "new": true, "upsert": true }, function(err, space) {
if (err) {
console.log(err);
} else {
console.log(req.body.space);
}
});
});
I can't access "author" correctly, because it's inside the array. What can I do to update this array, adding a new date and user to make the reservation?
Thank you
UPDATE
I tried to use "_id" instead of "id" in my property but got the same result. It seems like it's ignoring the "author" field, and only saving "scheduledDates"
So the schema was like this:
scheduledDates: [{
scheduledDates: String,
author: {
_id: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
username: String
}
}]
And then in my route, I changed what I was 'pushing':
'$push': { 'scheduledDates': req.body.space, 'author._id': req.user._id }
UPDATED 2
Changed the way I was getting the object to push:
'$push': {
'scheduledDates': {
'scheduledDates': req.body.space,
'author': { _id: req.user._id, username: req.user.username }
}
}
Now I'm getting the following error:
message: 'Cast to string failed for value "{ scheduledDates: \'04/11/2017\' }" at path "scheduledDates"',
name: 'CastError',
stringValue: '"{ scheduledDates: \'04/11/2017\' }"',
kind: 'string',
value: [Object],
path: 'scheduledDates',
reason: undefined } } }
This is the model I am working with:
name: {
type: String
},
payment: {
id: {
type: String,
required: true
},
cards: [
{
id: {
type: String
},
is_default: {
type: Boolean,
"default": false
}
}
]
}
I want to add a card to the cards array, for example:
card =
id: "some_token"
is_default: true
I am using the update method to push the card to the array, but it won't add the card to the document. Instead, it creates a new document with only those fields:
{
id: "some_token",
is_default: true,
_id: someId
}
Any idea how I can update the actual document I am targeting instead of creating a new document?
Here's my code (using CoffeeScript):
update_where =
payment:
id: "some_id"
update_push =
$push:
'payment.cards':
id: card_token
is_default: false
Customer.update update_where, update_push, {upsert: true}, (err, results) ->
# Do something with the results
Oh… I just noticed my mistake. The problem was in the where statement.
I was doing:
payment:
id: "some_id"
But the right thing to write is the following:
'payment.id': 'some_id'
And it now works!
I have looked everywhere, and I have not found an easy to understand method of updating a sequelize array, like this with a normal string:
db.User.update({name:req.body.name},{where : {username:req.body.username}}).then(function(user) {
res.json(user);
})
Sequelize doesn't support bulk updates using an array, see https://github.com/sequelize/sequelize/issues/4501
You have to implement a custom function.
Here is a basic example to give you an idea :
var promises = [];
userArray.forEach(function(user){
promises.push(db.User.update({name:user.name},{where : {username:user.username}});
});
Promise.all(promises).then(function(){
// success
}, function(err){
// error
});
Which I myself resolved as follows:
case 1: If you want to update multiple lines at the same value with different conditions
db.User.update({ name: 'name request' }, {
where: {
$or: [{ name: 'test 1', password: 'sasaccsa' }, {
name: "test 2"
}]
}
}).then(function(user) {
//query generate
// UPDATE `User` SET `name`='name request' WHERE ((`name` = 'test 1' AND `password` = 'sasaccsa') OR `name` = 'test 2')
res.json(user);
});
case 2: if you want to update multiple lines with different values for different types of reviews:
var arrayUpdate = [{
name: 'test 1',
id: 1
}, {
name: 'test 2',
id: 2
}, {
name: 'test 3',
id: 3
}];
sequelize.Promise.each(arrayUpdate, function(val, index) {
return db.User.update({
name: val.name
},{
where:{
id: val.id
}
}).then(function(user) {
}, function(err){
});
})
.then(function(updateAll){
//done update all
res.json(updateAll);
}, function(err){
});