I have a mongo db with companies with the following data structure:
{'Beschreibung': [],
'Branche': ['Doctor'],
'Homepage': 'http://www.doctorsdomain.de',
'Mail': None,
'Name': ['Companyname'],
'Ort': 'Doctors City',
'PLZ': '12345 ',
'StrHausnummer': 'Doctors Street',
'Telefonnummer': '1235345646',
'_id': ObjectId('sadfsdfawdfawedfbad5f'),
'domain': 'doctorsdomain',
'doctors': [{'Salutation': 'Dear Madame', 'Name': 'Maximiliane Mustermann'},
{'Salutation': 'Dear Mister', 'Name': 'Bernd Beispiel'}],
'other information'
I don't find the query to count how many names (doctors) I have in my database.
I tried something like
collection.find({"doctors":{"$exists":1}}).count()
but than I only get the number of the companies where doctors exists.
Need help please!
Thanks a lot!
Related
What is the proper way to request the following upsert to a REST API?
I'm struggling to structure a NoSQL collection, which is based on the most requested returns to the front-end application.
Suppose you have the following document:
{
'user' : {
'private_comments': [
//object available only to user 1
{
'id': 1,
'bar': 'He is very good',
'...': '...'
},
//object available only to user 2
{
'id': 2,
'bar': 'He is very bad',
'...': '...'
}
],
'public_comments': '' //infos available to all users
}
}
It is needed to upsert an element to the user.private_comments array.
According to https://www.rfc-editor.org/rfc/rfc6902#appendix-A.5, I could request a replace instruction PATCHing the following data:
{ 'op': 'replace', 'path': '/user/comments/$index', 'value': 'Actually, he is OK'}
The problem is that '$index' is unknown in this case.
A possible solution that I came up with was to create something like the following operation:
{ 'op': 'upsert', 'find_by': 'id', 'find': 1, 'path': '/user/comments', 'value': 'Nope, he really sucks' }
However, the user implementing the API should't provide the id value inside the PATCH request, because this value is already accessible via the receive token. Should I simplify the operation to:
{ 'op': 'upsert', 'path': '/user/comments', 'value': 'Nope, he really sucks' }
and treat it at the backend, so when it's and upsert operation without 'find' and 'find_by' variables I assume 'find_by': 'id' and 'find': value_from_token?
Also, I cannot do a simple GET/UPDATE at the hole document because the user doesn't receive the hole document, so an update would compromise the data.
My site has several "domains" which represent sub-sections of the site. Each "domain" has its own users with profiles, and a search page where you can search for users based on profile fields that the users fill out.
User data from the 'users' collection is structured like so:
{
username: 'shawnmichaels',
first_name: 'Shawn',
last_name: 'Michaels',
domains: [
{
name: 'domain1',
user_fields: {
'bio': 'Short bio related to domain 1',
'skills': 'Pertinent skills for domain 1'
}
},
{
name: 'domain2',
user_fields: {
'bio': 'Short bio related to domain 2',
'skills': 'Pertinent skills for domain 2'
}
}
]
}
So, users have field data across multiple domains. The domain names and field names are dynamic. There could potentially be hundreds of domains for a user and dozens of fields in a domain.
Is it possible to have some sort of dynamic index so that I can search for fields under 'domain1' without getting any matches in 'domain2'?
For example, if a user1 has "skills": ["karate", "judo"] under 'domain1', and I want to search domain2 for "karate", I don't want a match for user1.
For anyone interested, I've answered my own question after a day of research.
I'm pretty new to MongoDB and didn't realize you can query arrays by treating them like any other keys, like so:
db.users.find({domains.title: 'domain1'})
// where 'domains' is an array of object each with a 'title' key
With this knowledge, I added a text index for each field I want to be searchable:
db.users.ensureIndex({
'username': 'text',
'first_name': 'text',
'last_name': 'text',
'domains.fields.bio': 'text',
'domains.fields.skills': 'text',
'domains.fields.title': 'text',
'domains.fields.training': 'text'
}, {name: 'domain_search'})
And I structured search queries in each domain like so:
db.users.find({
'domains.title': DOMAIN_NAME,
'$text': {'$search': SEARCH_TERM}
})
This is from MongoDB.
I am following this tutorial.
I have the collection as shown below:
$ show collections
mycol
mycollection
system.indexes
test
tutorialspoint
Then when I attempt to insert a record in to the collection, using the syntax below, I get the error:
2014-04-18T08:03:55.168-0400 SyntaxError: Unexpected token ILLEGAL
db.mycol.insert({
_id: ObjectId(7df78ad8902c),
title: 'MongoDB Overview',
description: 'MongoDB is no sql database',
by: 'tutorials point',
url: 'http://www.tutorialspoint.com',
tags: ['mongodb', 'database', 'NoSQL'],
likes: 100
})
Below is the copy/paste from mongodb
db.mycol.insert({
... _id: ObjectId(7df78ad8902c),
... title: 'MongoDB Overview',
... description: 'MongoDB is no sql database',
... by: 'tutorials point',
... url: 'http://www.tutorialspoint.com',
... tags: ['mongodb', 'database', 'NoSQL'],
... likes: 100
... })
2014-04-18T08:03:55.168-0400 SyntaxError: Unexpected token ILLEGAL
Try the insert without the _id field. This is automatically generated by Mongodb.
Like this:
db.mycol.insert({
title: 'MongoDBOverview',
description: 'MongoDBisnosqldatabase',
by: 'tutorialspoint',
url: 'http: //www.tutorialspoint.com',
tags: [
'mongodb',
'database',
'NoSQL'
],
likes: 100
});
If you want to use the _id field:
Mongodb docs: Insert a document using the _id field
Ex: _id: 10
The value of _id must be unique within the collection to avoid
duplicate key error.
The value needs to be in quotes. Also, the string in the example is the wrong length. Insert something without specifying the _id field, then do a db.mycol.find() to see the correct format. The field is 12 bytes according to the documentation. The 24-character string is using 2 hex characters per byte. (NOTE: I am also a mongoDB noob, so I am sure there may be flaws with this answer.)
I'm trying to create a Meeting entry via the API, but I can't seem to find it in my calendar even though it saved successfully (I got the ID back) and I can see it in the Meetings list.
What fields do I need to populate for it to show in my Sugar calendar? Here are the fields I'm populating:
{
'assigned_user_id': '1', # My user's ID
'date_end': '2013-04-16 01:30:00',
'date_start': '2013-04-16 01:23:45',
'description': 'hello world',
'location': 'JCenter',
'name': 'Test',
'team_id': '1',
'type': 'Sugar' # This doesn't seem to be required
}
Try to set "user_id" and take a look into mettings_users table where you will find it.
What I am trying to do is add a new {field:value} for a blog post. So for example, if I wanted to start tracking impressions on websites.blog_posts.url: 'http://www.example.com/01.html' how can I add that impressions attribute for that blog post?
My current document structure:
{
email_address: 'webmaster#example.com',
password: 'random_password',
first_name: 'John',
last_name: 'Doe',
user_type: 'WEBMASTER',
newsletter: 'NO',
websites: [{
main_title: 'My Blog Website',
main_url: 'http://www.example.com',
blog_posts: [{
url: 'http://www.example.com/01.html',
title:'My first blog post',
description: 'My first description.'
}, {
url: 'http://www.example.com/02.html',
title: 'My second blog post',
description: 'My second description.'
}, {
url: 'http://www.example.com/03.html',
title: 'My third blog post',
description: 'My third description.'
}, {
url: 'http://www.example.com/04.html',
title: 'My fourth blog post',
description: 'My fourth description.'
}]
}]
}
Here is what I thought would work using update and making upsert TRUE.
db.my_collection.update( {'websites.blog_posts.url': 'http://www.example.com/01.html' }, {'$set': {'websites.blog_posts.impressions': 549}}, true )
The error that I received is:
*can't append to array using string field name [blog_posts]*
Maybe "$set" is not correct for this or maybe I can not reference that deep with dot notation? I just started using MongoDB yesterday, any help would be great.
Thank you!
What you're trying to do is not possible given your schema. Dot-notation can be multi level but if there's more than one level that is an array it can no longer be addressed using the positional operator '$'.
E.g. you'd need to do :
db.my_collection.update(
{'websites.blog_posts.url': 'http://www.example.com/01.html' },
{'$set': {'websites.$.blog_posts.$.impressions': 549}},
true );
But having two position operators in the update is not possible since MongoDB can only determine the position of an element in the first array.
Your only option is to redesign your schema to have a dedicated collection of user websites (which is better for other reasons too in this case).