Develop Reference

How can i translate query to sequelize?

select reservation_datetime
from LectureReservation
Inner Join Lecture
On LectureReservation.lecture_id = Lecture.id
Where Lecture.mentor_id = 1
This is my query and I want to change it to sequelize like
if (req.params.id) {
LectureReservation
.findAll({
include: [{
model: Lecture,
where: { mentor_id: req.params.id },
}],
attributes: ['reservation_datetime'],
where: {
lecture_id: Lecture.id,
},
this.. I tried it so hard but can't find solution and my postman keep showing me
"name": "SequelizeEagerLoadingError"
this err..
plz help me to translate query to sequelize..!

Sequelize will do _outer join without required = true.
The errors you have received usually is from association problem.
Try set logging :console.log and check the raw query.

Sequelize "WHERE" Clause in subqueries

I'am trying to build my query using sequelize, in the where clause I need to give the conditional value from my front-end so i did it like this :
getResults(req) {
return parm
.findAll({
attributes: [
sequelize.literal('DISTINCT "id"')
],
where : {
name: req.query.parm.replace(/"/g, '').split(',')
} ,
raw: true
});
}
and it's working!
but now I need to write a subquery including where clause:
something like this :
SELECT tab1.name FROM
(SELECT name FROM "MYTABLE"
WHERE id = (value from the front-end) AND name IN (values from front-end)
) as tab1
Here is what i have tried :
getTest(req) {
if (req.query.parm != null) {
return parm .sequelize.query('SELECT id FROM "table_base" where id = $mid ); ',
{ type: sequelize.QueryTypes.SELECT ,
bind: { mid: [req.query.parm.replace(/"/g, '').split(',')] }} );
}
},
i tried to use raw query and i tested the binding parameters but i get this error when i execute this testing query :
Executing (default): SELECT id FROM "table_base" where id = $1 );

The answer to your question is YES it is indeed possible! SQL can pretty much do anything even if you are using sequelize. If you write the subquery and it doesn't work just post it back here so people can take a look and debug. Thanks

bookshelf.js where and has query at same time

I'm trying to return from our db a query where:
event_id = event.attributes.id
user_to = user.id
stripeCharge IS NOT NULL
I think I can do this use the has feature in bookshelf. I can't seem to get both the where & has going at the same time. Here is what my query that works with just where:
analyticsPayments.where({
event_id: event.attributes.id,
user_to: user.id
}).fetch().then(function(payment) {
console.log(payment);
}).catch(function(err) {
console.log(err);
res.status(500).json(err);});
I tried putting in after the where .has(stripeCharge) but it didn't like that.
Any idea how to achieve what I am trying to do, or how to have both a where and a has clause?
Thanks

pouchdb put is still rejected with _rev

I'm using pouchDB for the first time, and as indicated in the docs I'm using put() so it will automatically handle revisions. However, when the code is running and there's an existing item with the same ID, it's still rejecting even when including a _rev.
Here's my code:
var db = new PouchDB('blog')
...
function saveCategory(category) {
var savedCategory = {
_id: 'category' + category.id,
_rev: '2-' + String(new Date().toISOString()),
name: category.name,
nicename: category.slug,
post_count: category.count,
description: category.description,
link: category.link,
parent: category.parent
}
return db.put(savedCategory).then((response) => {
$log.log(response)
}).catch((error) => {
$log.error('error saving category ',error)
})
}

This is not the purpose of the _rev field. It is always generated by the server and not by your code. To update a document you must pull the entire document (including the _rev field), update the desired fields, and then put the document. The value of _rev should be the same as when you got it from the server.
If you have a new record, you do not need to set _rev.
The pocketDB guide has a very useful section about this.

Meteor User table value axtracting

How do I pick the email address value from meteor Mongo user table?
I have written below query to pick the element:
users=Meteor.users.find({},{emails:1})
This the code I have written to fetch the email address, but I don't know how much it's affecting performance in the code:
users = Meteor.users.find({})
users.forEach(function(key,option){
key.emails.forEach(function (key,option){
console.log(key.address)
});
});

In meteor, you should call:
users = Meteor.users.find({}, { fields: { emails: 1 } })
Reference in docs
EDIT
Please remember users is a cursor object. Cursor objects can be handled directly in templates, and must be the return of publications. You can't iterate a cursor directly in a javascript loop.
Example: (remember authorization in production publications)
Meteor.publish('user-emails', function() {
return Meteor.users.find({}, { fields: { emails: 1 } });
});
If you want to directly access the user instances, for example to iterate them in a javascript code, you need to fetch the cursor (reference in docs).
Example:
var users = Meteor.users.find({}, { fields: { emails: 1 } }).fetch();
Now users is an array of users. Feel free to iterate them.
Example (I'm using underscore.js):
var users = Meteor.users.find({}, { fields: { emails: 1 } }).fetch();
_.each(users, function(user) {
console.log(user.emails);
});
Now, if you need a vector only with emails, one on each index, you can pluck the emails from a fetched array with underscore.js (reference of pluck)
var emails = _.pluck(Meteor.users.find({}, { fields: { emails: 1 } }).fetch(), 'emails');
Hope it works :)

if its not working, dont forget to return
return users