To filter the data?

Yeah, of course. Those. It will first be made to work for a collection, which is not a desired object, and then you want to delete these items? Better as soon as possible to cut off the unnecessary data ...

Sly32 asked the abstract question - challenge for a first grader. Not the essence of this task is displayed. This can be recursive. Well, for example, at such a facility:

 db.runCommand ({ 'collStats': 'ttu'}) 
 { 
 "Ns": "tesh.ttu" 
 "Size": 843057200, 
 "Count": 3367400, 
 "AvgObjSize": 250, 
 "StorageSize": 90828800, 
 "Capped": false, 
 "WiredTiger": { 
 "Metadata": { 
 "FormatVersion": 1 
 } 
 ................. 
 "TotalIndexSize": 641056768, 
 "IndexSizes": { 
 "_Id_": 355459072, 
 "Name_text_text_text": 285597696 
 } 
 "ScaleFactor": 1, 
 "Ok": 1 

For example do not remove and leave "bytes currently in the cache"> xxxx

It is there somewhere in the remote ..........

 "WiredTiger": { 
 "Cache": { 
 "Bytes currently in the cache": 108254, 

----------

He reduced as he could

He argues that this is a very important task. 😎

No. It receives data from the database.

Come on, probably joking.

 It never is coming from. Recursion, is to ensure that it could have been so in the problem: 
 { 
 'Id': 0 
 'Media_category': 'clip', 
 'Child': { 
 'Id': 22, 
 'Media_category': 'clip', 
 'Child': { 
 'Id': 27, 
 'Media_category': 'clip', 
 'Child': { 
 'Id': 77, 
 'media_category': 'xxx', 
 } 
 } 
 } 
 } 

Are you serious or what?

https://www.google.com/search?client=firefox-bd&q=php+%D1%84%D0%B8%D0%BB%D1%8C%D1%82%D1%80%D0%B0%D1% 86% D0% B8% D1% 8F + json +% D0% B4% D0% B0% D0% BD% D0% BD% D1% 8B% D1% 85

here is the solution of the non-programmers))

Well, Chet doubt that this database is no built-in way to filter data

Undoubtedly, the better. But there is business logic, and within it is not always possible

Well, that's an example of an example in this case, I will try to explain why it is not profitable to do at the database level. Request to postgress done 1 time, then the data stored in the radishes and various case studies I need to get different totals. The task - only one of them. I do not need every time to knock in the database, I am working with the already received collection.

Therefore it is necessary to solve by means of language and not talk - how else to do it.

I'm not interested in what is in Google - it was interesting to offer people to play with something more than customize plugins. Anyone who knows how to think - was involved and suggested solutions, babblers began to reason ...

at the end - the code in Python - the shortest and most readable)

Those who replied in essence - thanks for an interesting discussion)

---------- Posted 14.06.2020 at 13:24 ----------

Important, but I did not say that the complex or for seniors - so fun. I like to have spent more time writing tests than on the task itself)

but also short! = is the fastest?

Well and readability is probably a subjective concept in the present case

Check, if in doubt)

Whiling away - yes, and readable - definitely not.

And the slowest.

Well, again, you're not thrown off all the code file.

 data = [
    { 'Id': 0, 'media_category': 'clip'}, 
 { 'Id': 1, 'media_category': 'promo'}, 
 { 'Id': 2, 'media_category': 'promo'}, 
 { 'Id': 3, 'meda_category': 'promo'}, 
 { 'Id': 4, 'media_category': 'clip'}] 


 def filter_data (data): 
 return filter (lambda _data: _data.get ( 'media_category') not in [ 'promo'], data) 


 result = filter_data (data) 
 for item in result: 
 print (item) 

in fact, the code itself - lines 9-10, the rest - to check any pitonovskoj console. As part of the task, I need to insert 2 lines to the existing code - a key check, you need to filter and filtering itself.

About speed - it is clear that the first will be faster, but it is compiled into spython in reality, there has not much important.

Dve and principle, I have nothing against the code on php, this is not a topic for sracha)

Thank you all for your participation, we will have in Minsk - happy Crossing for a beer. I think the topic is exhausted