Create APIs for Aggregations and Joins on MongoDB in Beneath 15 Minutes

0/5 No votes

Report this app



Rockset has teamed up with MongoDB so you may construct real-time apps with information throughout MongoDB and different sources. If you happen to haven’t heard of Rockset or know what Rockset does, you’ll by the top of this information! We’ll create an API to find out air high quality utilizing ClimaCell information on the climate and air pollution.

Air high quality has been documented to impact human well being (sources on the backside). Specifically, ranges of particulate matter (PM), sulfur dioxide (SO2), nitrogen dioxide (NO2), the ozone molecule (O3), and carbon monoxide (CO) are measured with a purpose to recommend an individual’s advisable exercise degree outside. What results PM, SO2, NO2, O3, and CO ranges are topic to in depth examine: scientists look at temperature, humidity, visitors congestion, wind gust, and so forth to see how the air high quality index (AQI) adjustments with respect to those pollution.

It’s vital to notice that it is a pattern app to point out how MongoDB can combine with Rockset and demo Rockset’s tremendous powers of constructing APIs. This isn’t a scientific undertaking that’s meant to be exhaustive in its conclusion. Far more information is required, and plenty of variables will not be considered when doing the question. For extra on air air pollution, see beneath on sources. To leverage Rockset and MongoDB in your real-time purposes (scientific or not), proceed studying!

In subsequent tutorials, I can present how this dataset can doubtlessly be used to grasp how temperature and humidity impacts AQI of PM and O3. You’re additionally welcome to do the challenges on the finish of the tutorial to earn Rockset credit score, swag, and extra!

On this information, we’re going to:

  1. Combine MongoDB Atlas and Rockset

    • Construct collections on MongoDB that may every map to Rockset’s collections
  2. Construct a Python script that may constantly get the climate and air high quality information from ClimaCell (Powered by ClimaCell) and put it into MongoDB
  3. Use Rockset’s Question Editor to write down a question on real-time information coming in from MongoDB
  4. Create an API to the question we wrote
  5. Execute the API in our app and print out a press release concerning the air high quality


Let’s get began on MongoDB

  1. After you’ve created an account on MongoDB Atlas, go forward and navigate to Database Entry → Customized Roles and click on on Add New Customized Function. The picture beneath is what actions and roles ought to be added for rockset-role. Rockset has safe read-only entry to MongoDB Atlas.

Create a Rockset role

  1. Navigate to the Database Customers tab and click on on Add New Database Person. Bear in mind the password right here, as a result of we might want to use it once more, once we create an integration on Rockset.

Add new database user

  1. Go forward and create one other database consumer that has Atlas admin privileges. We shall be utilizing this database consumer in our Python app. You may identify this consumer yourName-admin. Ensure you keep in mind the password right here, as a result of we’ll use this in our Python app.
  2. Navigate to the Community Entry click on on Add IP Tackle and whitelist these IPs:
    Embedded content material:

Whitelist Rockset's and your IP addresses

  1. Navigate to Clusters and click on on Collections then click on on Create database. We’re going to create a weather_pollution_db and it’s going to have weather_data assortment.

    Create the database and weather_data collection on MongoDB
  2. Beneath the weather_pollution_db, there’s going to be a plus signal. Click on on the plus signal, and add one other assortment, air_pollution_data.

Create an air_pollution_data collection

  1. Return to Clusters and click on on Join and click on on Join your software. Copy the string, as a result of we’ll use it in Rockset. Once we are in our Rockset account, the username is rockset-user and the password is the password you used while you created rockset-user. In our Python app, the username shall be yourName-admin and the password related to that database consumer.

Copy the connection string

  1. That’s it for MongoDB! Let’s go forward and write our Python app!

Let’s construct our Python app

  1. Create a undertaking folder, and in that undertaking, create a file .env.
  2. Within the .env file add this:

    • Mongo_URI=“<uri string>”
    • The "<uri string>" is your connection string from MongoDB. Ensure you exchange the username and password within the connection string with yourName-admin and the password you used while you created that database consumer.
    • It ought to look one thing like this:
  3. If you happen to use a virtualenv go forward activate a env for this undertaking. Ensure you’re below Python 3.7 or increased.

    • I personally use Pyenv, however be happy to make use of no matter you need!
  4. Set up python-dotenv:

    • $ pip set up python-dotenv
  5. Set up [pymongo] and [dnspython]:

    • $ pip set up pymongo
    • $ pip set up dnspython==1.16.0
  6. Inside our undertaking folder, go forward and create This file ought to appear like this: Embedded content material:
  7. Create one other file within the undertaking folder referred to as It ought to appear like this: Embedded content material:
  8. Within the undertaking folder, go forward and create file referred to as All we’re going to do is ensure our Python app is connecting to MongoDB: Embedded content material:
  9. Beneath Clusters, click on on the collections button. Go to weather_pollution_db and click on on weather_data. You must see this:

See JSON data from the Python app

  1. Now that we all know we are able to insert information into MongoDB, let’s go forward and create a ClimaCell developer account and get an API KEY.

  2. In go forward and add this:

    • CLIMACELL_API_KEY = os.environ.get('CLIMACELL_API_KEY')
  3. I selected ClimaCell as a result of they provide realtime information for climate and air air pollution. We’re going to work with this api. They’ve totally different parameters that may be added to the request. You may discover these right here.
  4. In our undertaking folder go forward and pip set up a number of libraries:

    • $ pip set up requests
    • $ pip set up timeloop
  5. In go forward modify the packages we’re going to make use of: Embedded content material:

    • Timeloop a library that may run jobs at designated intervals.
  6. Hold insert_to_mongo() and add this operate in to get the climate information: Embedded content material:

    • That lat and lon correspond to Beijing.
  7. Now, we’re going so as to add this operate to get the air high quality: Embedded content material:
  8. We’ll modify insert_to_mongo() to appear like this: Embedded content material:
  9. To verify we’re operating constantly, write this: Embedded content material:
  10. After, write essential() like this: Embedded content material:
  11. This is a gist of what your ought to appear like: Embedded content material:
  12. Now, run:

    • $ python to populate MongoDB.
  13. Whereas the script is operating, let’s get began on Rockset.

Let’s get began on Rockset

  1. Login to Rockset and navigate to the Integrations tab on the left. Click on on Add Integration. Click on on MongDB and click on on begin:

click on MongoDB

  1. Verify the primary field MongoDB Atlas. We’re going to call this integration Rockset-Mongo-Integration. For the username and password, go forward and put rockset-user and the password you utilize while you created this database consumer. Paste the connection string within the subsequent field and click on on Save Integration.

    • Every integration can be utilized to entry a number of databases and collections in the identical MongoDB cluster

Save integration

  1. Beneath Collections click on on Create Assortment. Choose MongoDB because the supply.

Click on MongoDB source

  1. Click on on the rockset-mongo-integration.
  2. We’re going to call our new assortment on Rockset weather_data_collection. This isn’t tied to MongoDB. Go forward and fill out the remainder of the web page with the database and assortment we created on MongoDB. We’re going so as to add 2 collections, however let’s begin with the weather_data from MongoDB.

    • You see, Rockset is in a position to connect with MongoDB. You may confirm what information shall be ingested into the Rockset assortment on the right-hand facet. While you’ve created a group and operating a data-driven app in real-time, Rockset will constantly sync with MongoDB so your information can have the newest info.
    • Let’s click on Create on the backside.


  1. Comply with the identical steps, step 3-5, to create the gathering, air_pollution_data_collection. On the finish, it ought to appear like this:

Verify data for air_pollution_db

  • Observe permissions will be modified within the MongoDB UI at any time with out the necessity to drop and recreate integration. Besides when username and/or password or connection string adjustments – then the consumer might want to drop and recreate the Rockst integration

Assemble a Question on Rockset

  1. On the left bar, let’s navigate to the Question Editor.
  2. On the tab if we write:

    • Choose * from commons.air_pollution_data_collection; we must always see some output:

Output of query

  - Go forward and do that for the `weather_data_collection`
  1. We’re going to write down this pattern question: Embedded content material:

    • We’re averaging the PM10 information and the climate temperature information. We’re going to affix each of those collections primarily based on the date. If you happen to observed the timestamp within the JSON, the date is in ISO 8601 format. In an effort to be a part of on the times (and eliminates the minutes, hours, and seconds), we’re going to do an extraction.
  2. Run the question.
  3. After we run this question, we need to embed it in our app, so we are able to notify our customers when the degrees fluctuate, and doubtlessly predict, primarily based on climate, what PM10 ranges might appear like the following day.

    • We’re going to wish much more information than what we now have now to foretell primarily based on temperature, however it is a begin!

Construct an API on our question on Rockset

  1. On the highest nook, click on on Create Question Lambda. A Question Lambda is a option to make an API endpoint to the SQL question you write. Within the Python app, we received’t have to write down client-side SQL, stopping safety vulnerabilities.


  1. Give your Question Lambda a reputation and outline. Afterwards, you need to see some code snippets on the following display screen.
  2. Let’s navigate again on the Question Editor and write one other question to get present climate in a brand new tab. Typically we might get a null subject, so let’s go forward and write this within the Question Editor: Embedded content material:
  3. Create one other new Question Lambda.
  4. If we need to seize the code snippet or URL of the Question Lambdas we simply created, navigate on the left facet menu to Question Lambda and click on on the lambda you created.

Execute APIs on our app

  1. When you create a Question Lambda, you’ll see one thing like this:

    Get Code Snippet to execute API
  2. There are two methods I’ll present how we are able to execute a lambda:

    • Make an HTTP Request
    • Rockset’s Python consumer (backside field the place my API is boxed out)
  3. Make an HTTP Request:

    • Let’s go forward and make an HTTP request to get the current_weather information. Listed here are the steps to do that:
    • Go forward and set your ROCKSET_API_KEY in your .env. Import it in like we did earlier than.
    • On Rockset, navigate to the Question Lambda that has the current_weather question. Copy the question lambda endpoint.
    • We’re going to write down this operate that may make an HTTP request to that endpoint:Embedded content material:
  4. Use the Rockset Shopper to ship a request:

  5. Then, we’re going to show the end result:Embedded content material:
  6. We’re going to alter sample_job_every_120s()so as to add make_requests so we are able to execute the Question Lambdas and show the info:Embedded content material:
  7. Write make_requests() so it seems to be like this:Embedded content material:
  8. After you run the script, you need to see this:Embedded content material:
  9. That’s it! This wraps it up for the MongoDB-Rockset Python App!

Mission Code

You will discover the complete undertaking, together with the SQL statements right here. When you’ve got questions concerning the undertaking, Rockset, or MongoDB, you may attain out in our neighborhood.


Different MongoDB sources:


Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.