@enigmatis/polaris-typeorm

polaris-typeorm

Install

npm install polaris-typeorm

Overview

This library provides support and wrappers for typeorm functionality. [Typeorm]

createPolarisConnection

Through this method we can create the polaris connection to our DB on top of typeorm.

 const connection: PolarisConnection = await createPolarisConnection(
        connectionOptions,
        polarisGraphQLLogger,
    );

The createPolarisConnection method receives:

• ConnectionOptions from typeorm (see documentation on typeorm)
• AbstractPolarisLogger from @enigmatis/polaris-logs, implemented by PolarisGraphQLLogger from @enigmatis/polaris-graphql-logger or by PolarisLogger from @enigmatis/polaris-logs

PolarisConnection

This class extends the typeorm Connection class. Through a PolarisConnection we will have access to the PolarisRepository.

    const authorRepo: PolarisRepository = connection.getRepository(Author);

PolarisRepository

This class extends the typeorm Repository class. In addition to the types required by typeorm functions in this class, we added a requested field in each function we've overridden. That field is PolarisGraphQLContext from @enigmatis/polaris-common which we must have for the filters and additions answering the api standards.

    await authoRepo.find(context, { where: {name:"chen"}}));

PolarisConnectionManager

This class extends the typeorm ConnectionManager. Using the next method you will get your polarisConnection from every place in the code.

    const connection: PolarisConnection = getPolarisConnectionManager().get();

CommonModel

This class represents the base entity that all of your polaris entities should inherit from. It provides default fields for your entity :

• createdBy(string - Optional) - this field indicates who created the entity.
• creationTime - when was the entity created.
• lastUpdateBy(string - Optional) - this field indicates who last updated the entity.
• lastUpdateTime - when was the entity last updated.
• dataVersion - every common model is a versioned entity and contains a version related to their data - a dataVersion.
• realityId - this field indicates what is the reality of the entity.
• deleted - this field indicates whether the entity is "soft deleted".

Let's take a look at a simple example :

@Entity()
export class SimpleEntity extends CommonModel {
...
}

So now SimpleEntity also includes all of the above properties.

PolarisEntityManager

This class extends the typeorm original EntityManager logic and adds relevant filters and actions such as reality filters, data version filters and also supports the soft delete mechanism. You can access this CRUD methods in 2 ways :

1. through the PolarisEntityManager class.
2. through typeorm repositories.

TypeORMConfig

Through this config you should set whether you want soft delete mechanism in your repository. The default value of allowSoftDelete is true, you can set it to false by sending allowSoftDelete as false.