TransactionalConnection

TransactionalConnection

The TransactionalConnection is a wrapper around the TypeORM Connection object which works in conjunction with the Transaction decorator to implement per-request transactions. All services which access the database should use this class rather than the raw TypeORM connection, to ensure that db changes can be easily wrapped in transactions when required.

The service layer does not need to know about the scope of a transaction, as this is covered at the API by the use of the Transaction decorator.

Signature

class TransactionalConnection {
  constructor(connection: Connection, transactionWrapper: TransactionWrapper)
  rawConnection: Connection
  getRepository(target: ObjectType<Entity> | EntitySchema<Entity> | string) => Repository<Entity>;
  getRepository(ctx: RequestContext | undefined, target: ObjectType<Entity> | EntitySchema<Entity> | string) => Repository<Entity>;
  getRepository(ctxOrTarget: RequestContext | ObjectType<Entity> | EntitySchema<Entity> | string | undefined, maybeTarget?: ObjectType<Entity> | EntitySchema<Entity> | string) => Repository<Entity>;
  async withTransaction(work: (ctx: RequestContext) => Promise<T>) => Promise<T>;
  async withTransaction(ctx: RequestContext, work: (ctx: RequestContext) => Promise<T>) => Promise<T>;
  async withTransaction(ctxOrWork: RequestContext | ((ctx: RequestContext) => Promise<T>), maybeWork?: (ctx: RequestContext) => Promise<T>) => Promise<T>;
  async startTransaction(ctx: RequestContext) => ;
  async commitOpenTransaction(ctx: RequestContext) => ;
  async rollBackTransaction(ctx: RequestContext) => ;
  async getEntityOrThrow(ctx: RequestContext, entityType: Type<T>, id: ID, options: GetEntityOrThrowOptions<T> = {}) => Promise<T>;
  findOneInChannel(ctx: RequestContext, entity: Type<T>, id: ID, channelId: ID, options: FindOneOptions = {}) => ;
  findByIdsInChannel(ctx: RequestContext, entity: Type<T>, ids: ID[], channelId: ID, options: FindOneOptions) => ;
}

Members

constructor

method
type:
(connection: Connection, transactionWrapper: TransactionWrapper) => TransactionalConnection

rawConnection

property
type:
Connection
The plain TypeORM Connection object. Should be used carefully as any operations performed with this connection will not be performed within any outer transactions.

getRepository

method
type:
(target: ObjectType<Entity> | EntitySchema<Entity> | string) => Repository<Entity>
Returns a TypeORM repository. Note that when no RequestContext is supplied, the repository will not be aware of any existing transaction. Therefore calling this method without supplying a RequestContext is discouraged without a deliberate reason.

getRepository

method
type:
(ctx: RequestContext | undefined, target: ObjectType<Entity> | EntitySchema<Entity> | string) => Repository<Entity>
Returns a TypeORM repository which is bound to any existing transactions. It is recommended to always pass the RequestContext argument when possible, otherwise the queries will be executed outside of any ongoing transactions which have been started by the Transaction decorator.

getRepository

method
type:
(ctxOrTarget: RequestContext | ObjectType<Entity> | EntitySchema<Entity> | string | undefined, maybeTarget?: ObjectType<Entity> | EntitySchema<Entity> | string) => Repository<Entity>

withTransaction

async method
v1.3.0
type:
(work: (ctx: RequestContext) => Promise<T>) => Promise<T>

Allows database operations to be wrapped in a transaction, ensuring that in the event of an error being thrown at any point, the entire transaction will be rolled back and no changes will be saved.

In the context of API requests, you should instead use the Transaction decorator on your resolver or controller method.

On the other hand, for code that does not run in the context of a GraphQL/REST request, this method should be used to protect against non-atomic changes to the data which could leave your data in an inconsistent state.

Such situations include function processed by the JobQueue or stand-alone scripts which make use of Vendure internal services.

If there is already a RequestContext object available, you should pass it in as the first argument in order to add a new transaction to it. If not, omit the first argument and an empty RequestContext object will be created, which is then used to propagate the transaction to all inner method calls.

Example

private async transferCredit(fromId: ID, toId: ID, amount: number) {
  await this.connection.withTransaction(ctx => {
    await this.giftCardService.updateCustomerCredit(fromId, -amount);

    // If some intermediate logic here throws an Error,
    // then all DB transactions will be rolled back and neither Customer's
    // credit balance will have changed.

    await this.giftCardService.updateCustomerCredit(toId, amount);
  })
}

withTransaction

async method
type:
(ctx: RequestContext, work: (ctx: RequestContext) => Promise<T>) => Promise<T>

withTransaction

async method
type:
(ctxOrWork: RequestContext | ((ctx: RequestContext) => Promise<T>), maybeWork?: (ctx: RequestContext) => Promise<T>) => Promise<T>

startTransaction

async method
type:
(ctx: RequestContext) =>
Manually start a transaction if one is not already in progress. This method should be used in conjunction with the 'manual' mode of the Transaction decorator.

commitOpenTransaction

async method
type:
(ctx: RequestContext) =>
Manually commits any open transaction. Should be very rarely needed, since the Transaction decorator and the internal TransactionInterceptor take care of this automatically. Use-cases include situations in which the worker thread needs to access changes made in the current transaction, or when using the Transaction decorator in manual mode.

rollBackTransaction

async method
type:
(ctx: RequestContext) =>
Manually rolls back any open transaction. Should be very rarely needed, since the Transaction decorator and the internal TransactionInterceptor take care of this automatically. Use-cases include when using the Transaction decorator in manual mode.

getEntityOrThrow

async method
type:
(ctx: RequestContext, entityType: Type<T>, id: ID, options: GetEntityOrThrowOptions<T> = {}) => Promise<T>
Finds an entity of the given type by ID, or throws an EntityNotFoundError if none is found.

findOneInChannel

method
type:
(ctx: RequestContext, entity: Type<T>, id: ID, channelId: ID, options: FindOneOptions = {}) =>
Like the TypeOrm Repository.findOne() method, but limits the results to the given Channel.

findByIdsInChannel

method
type:
(ctx: RequestContext, entity: Type<T>, ids: ID[], channelId: ID, options: FindOneOptions) =>
Like the TypeOrm Repository.findByIds() method, but limits the results to the given Channel.