#MONGODB GENERATE TEST DATA GENERATOR#
#MONGODB GENERATE TEST DATA UPDATE#
#MONGODB GENERATE TEST DATA DRIVER#

#MONGODB GENERATE TEST DATA GENERATOR#

If you choose a data generator instead, you can find one for MySQL in one of the repositories on our Percona Lab GitHub account. This library supports different formats, including CSV and JSON, and it also provides a method for inserting data into a SQL database. In the first case, if you need to process the data before inserting it into the database, you can use Pandas, a widely used Python library for data analysis. Return db.collection('users').If you need test data for the database of your project, you can get a dataset from Kaggle or use a data generator. migrations/`Ĭonst migratePath = path.join(_dirname, '.', '.', 'node_modules/migrate/bin', 'migrate')Ĭonst migrate = run.bind(null, migratePath) So in order to automate this, we will read name at runtime and extract the last name and save it as new property.Ĭreate a migration with this command: $ migrate create add-last-name.js Now we want to change the schema to have a separate last name property. Let’s take an example of a User schema where we have a property name which includes both first and last name. migrations/ will be created with the following content: 'use strict' To create a migration, execute migrate create with a title.īy default, a file in. What is the current version of the schema we are usingĪnd without states, there is no way to rollback, upgrade, and vice-versa to a different state.

Bluebird: Promise library for handling async API callsĪ migration state is the most important key for keeping track of your current migration.Chai - Assertion library for writing test cases.

#MONGODB GENERATE TEST DATA DRIVER#

mongodb - a Native driver of MongoDB for Nodejs.

node-migrate - Abstract migration framework for Node.

I have tried others too, but some of them are not well-maintained anymore, and I faced issues getting set up with others. There are quite a few npm modules available already, but I have used the library node-migrate.

#MONGODB GENERATE TEST DATA UPDATE#

So you need to query all the documents where this member doesn’t exist and update them. When a member has been added to the schema, existing document won’t have the info. Since this article is about automating migrations, I am going to show you how you can write a simple script that will take care of schema changes as well as unit tests. I personally see this as overhead to maintaining code and it becomes inflexible. If the code is somehow removed, then many of documents are not upgradeable.įor instance, if there have been 3 versions of a document, and we remove the upgrade code from version 1 to version 2, any documents that still exist as version 1 are not upgradeable.

The second one is much more code-dependent and must stay in your codebase. Write a script that will take care of upgrading the schema as well as downgrading it to previous versions.So how do you handle all of the above changes? The representation of a member is changed.There are a number of different ways that a schema can change from one version of your application to the next. And we have to make sure data remains consistent throughout the application.

As a software developer at some point, you might have to deal with database migrations in one way or another.Īs software or applications evolve and improve over the time, your database must as well.

Mongodb generate test data