I'm trying to publish certain fields to a page based on a parameter of a document in a mongo collection. This is from the MongoDB manual: https://docs.mongodb.com/manual/reference/operator/aggregation/cond/
Does Meteor support conditional aggregation?
return Cases.find({
subscribers: { $in: [this.userId] }
}, {
fields: { $cond: [ { $eq: ['classified', true] } , Cases.privateFields, Cases.publicFields ] }
});
So, I realized I was approaching aggregates incorrectly. After doing some research on options to implement aggregation (meteorhacks) I decided to implement my own, which keeps the reactivity of the collection:
Extend Mongo.Collection
class CasesCollection extends Mongo.Collection {
conditionalFields(selector, modifier) {
let cond = modifier.fields[0],
pos = modifier.fields[1],
neg = modifier.fields[2];
if ( cond ) {
modifier = { fields: pos };
} else {
modifier = { fields: neg };
}
const cursor = this.find(selector, modifier);
return cursor;
}
}
Usage:
Meteor.publish('cases.dashboard', function casesDashboard() {
if (!this.userId) {
return this.ready();
}
return Cases.conditionalFields({
subscribers: { $in: [this.userId] }
}, {
fields: [ { $eq: ['classified', true] } , Cases.privateDashboardFields, Cases.dashboardFields ]
});
});
Related
This code does not match the bu.subUser with subUser and due to mismatch nothing is returned. How to achieve the output?
{
$match: {
subUser: {
$ne: blockedUsers.map((bu) => {
return bu.subUser;
}),
},
},
}
{ $match: { subUser: { $nin: blockedUsers.map((bu) => bu.subUser) } } }
I am using json-rule-engine .
https://www.npmjs.com/package/json-rules-engine
I am having a student list which have name and their percentage, Also I have business rule the percentage should be greater thank or equal to than 70 . so I want to print all students name those have percentage more than 70
here is my code
https://repl.it/repls/AlienatedLostEntropy#index.js
student list
const students = [
{
name:"naveen",
percentage:70
},
{
name:"rajat",
percentage:50
},
{
name:"ravi",
percentage:75
},
{
name:"kaushal",
percentage:64
},
{
name:"piush",
percentage:89
}
]
rule
engine.addRule({
conditions: {
all: [
{
fact: "percentage",
operator: "greaterThanInclusive",
value: 70
}
]
},
onSuccess(){
console.log('on success called')
},
onFailure(){
console.log('on failure called')
},
event: {
type: "message",
params: {
data: "hello-world!"
}
}
});
code
https://repl.it/repls/AlienatedLostEntropy#index.js
any update
The json-rules-engine module takes data in a different format. In your Repl.it you have not defined any facts.
Facts should be:
let facts = [
{
name:"naveen",
percentage:70
},
[...]
Also, the module itself doesn't seem to process an array of facts. You have to adapt it to achieve this. This can be done with:
facts.forEach((fact) => {
engine
.run(fact)
[...]
Finally, the student data is found inside the almanac. You can get these values with: results.almanac.factMap.get('[name|percentage|age|school|etc]').value
Here is the updated Repl.it: https://repl.it/#adelriosantiago/json-rules-example
I might have submitted a completely unrelated answer, but here goes. Since the students object is an array, you could just loop through it and then use an if else statement.
for (let i = 0; i < students.length; i++) {
if (students[i].percentage >= 70) {
console.log(students[i].name);
}
}
Sorry if this is incorrect!
Here is a working example.
Counting success and failed cases
const { Engine } = require("json-rules-engine");
let engine = new Engine();
const students = [
{
name:"naveen",
percentage:70
},
{
name:"rajat",
percentage:50
},
{
name:"ravi",
percentage:75
},
{
name:"kaushal",
percentage:64
},
{
name:"piush",
percentage:89
}
]
engine.addRule({
conditions: {
all: [{
fact: 'percentage',
operator: 'greaterThanInclusive',
value: 70
}]
},
event: { type: 'procedure_result'}
})
let result = {success_count : 0 , failed_count : 0}
engine.on('success', () => result.success_count++)
.on('failure', () => result.failed_count++)
const getResults = function(){
return new Promise((resolve, reject) => {
students.forEach(fact => {
return engine.run(fact)
.then(() => resolve())
})
})
}
getResults().then(() => console.log(result));
I wish to update a property per object in array of objects, but if some of the objects doesn't exists, insert the object instead.
Currently I used "upsert", which creates a new document when no document matches the query, unfortunately it is replacing a single item with my entire list.
Worth to mention that I am using mongoist to perform an async requests.
My code:
this.tokenArray = [
{ token: "654364543" },
{ token: "765478656" },
{ token: "876584432" },
{ token: "125452346" },
{ token: "874698557" },
{ token: "654364543" }
]
database.upsertDatebaseItem(this.tokenArray.map(x => { return x.token }), { valid : true }, 'Tokens');
async upsertDatebaseItem(itemKey, itemValue, collectionName) {
try {
await this.database[collectionName].update({ token : { $in: itemKey}}, { $set: itemValue }, {upsert : true} , {multi : true});
} catch (error) {
console.log(`An error occurred while attempting to update ${itemType} to the database: ${error}`);
return false;
}
}
Found the way to do it:
const bulkUpdate = this.tokenArray.map((x) => {
return {
"updateOne": {
"filter": { "token": x.token },
"update": { "$set": { "valid": true } },
"upsert": true
}
};
});
and:
this.database[collectionName].bulkWrite(bulkUpdate);
To upsert with mongoist, use the following:
var bulk = db.collection.initializeOrderedBulkOp()
for(var doc of docs) bulk.find( { _id: doc._id } ).upsert().updateOne(doc); // or use replaceOne()
await bulk.execute();
Converted to your case that would be
var bulk = db.collectionName.initializeOrderedBulkOp()
for(var tokenItem of tokenArray) bulk.find( { token : tokenItem.token } ).upsert().updateOne(tokenItem); // or use replaceOne()
await bulk.execute();
I have two filters in my custom panel in Kibana3:
request = request.query(
$scope.ejs.FilteredQuery(
boolQuery,
filterSrv.getBoolFilter(filterSrv.ids()) // has to be merged with BoolFilter2
))
.size($scope.panel.size);
This works for either of the two filters but I want to filter with the two objects but I dont know how to merge them. Can anyone help?
Kibana 3 filters can be set to the "either" mode instead of "must".
This translates into filters that look like this:
{
"filter": {
"bool": {
"should": [
{
"fquery": {
"query": {
"query_string": {
"query": "test1"
}
},
"_cache": true
}
},
{
"fquery": {
"query": {
"query_string": {
"query": "test2"
}
},
"_cache": true
}
}
]
}
}
}
Here is the filterSrv code that handles that in Kibana 3: https://github.com/elasticsearch/kibana/blob/3.0/src/app/services/filterSrv.js#L144
this.getBoolFilter = function(ids) {
var bool = ejs.BoolFilter();
// there is no way to introspect the BoolFilter and find out if it has a filter. We must keep note.
var added_a_filter = false;
_.each(ids,function(id) {
if(dashboard.current.services.filter.list[id].active) {
added_a_filter = true;
switch(dashboard.current.services.filter.list[id].mandate)
{
case 'mustNot':
bool.mustNot(self.getEjsObj(id));
break;
case 'either':
bool.should(self.getEjsObj(id));
break;
default:
bool.must(self.getEjsObj(id));
}
}
});
// add a match filter so we'd get some data
if (!added_a_filter) {
bool.must(ejs.MatchAllFilter());
}
return bool;
};
this.getEjsObj = function(id) {
return self.toEjsObj(dashboard.current.services.filter.list[id]);
};
You could modify that function to take an optional argument that sets the mandate to either.
I have the following document:
{
"gameName":"Shooter",
"details":[
{
"submitted":1415215991387,
"author":"XYZ",
"subPlayer":{
"members":{
"squad1":[
{
"username":"John",
"deaths":0
}
]
},
"gameSlug":"0-shooter"
}
}
],
"userId":"foL9NpoZFq9AYmXyj",
"author":"Peter",
"submitted":1415215991608,
"lastModified":1415215991608,
"participants":[
"CXRR4sGf5AdvSjdgc",
"foL9NpoZFq9AYmXyj"
],
"slug":"1-shooterConv",
"_id":"p2QQ4TBwidjeZX6YS"
}
... and the following Meteor method:
Meteor.methods({
updateDeaths: function(gameSlug, user, squad) {
Stats.update({details.subPlayer.gameSlug: gameSlug}, ...}); // ???
}
});
My goal is to update the field deaths. The method has the argument user which is the user object (username = user.username). Furthermore, the argument squad is the squad name as string, e.g. squad1.
How can I do this?
Any help would be greatly appreciated.
You should use something like this:
db.collection.update(
{'userId':'foL9NpoZFq9AYmXyj', 'details.subPlayer.gameSlug':'0-shooter'},
{'$set':
{'details': [{
'subPlayer': {
'members': {
'squad1':[{'username':'John','death':1}]
}
}
}]
}
}
)
UPD:
Also, maybe a better way is to use find().snapshot().forEach(). But I don't know how Meteor supports it. Example:
Stats.find({'userId':'foL9NpoZFq9AYmXyj', 'details.subPlayer.gameSlug':'0-shooter' }).map(function (e) {
e.details.forEach(function (d) {
var squad = 'squad1';
d.subPlayer.members[squad].forEach(function (s) {
s.deaths = 10000;
});
});
Stats.update({'_id': e._id}, e);
});