Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/thekevinbrown/mikro-676

Last synced: about 2 months ago
JSON representation

Host: GitHub
URL: https://github.com/thekevinbrown/mikro-676
Owner: thekevinbrown
License: mit
Created: 2020-07-22T00:51:00.000Z (over 4 years ago)
Default Branch: master
Last Pushed: 2023-01-07T20:21:32.000Z (almost 2 years ago)
Last Synced: 2023-09-06T09:44:56.166Z (over 1 year ago)
Language: HTML
Size: 2.14 MB
Stars: 1
Watchers: 2
Forks: 0
Open Issues: 15
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

        # Mikro ORM Reproduction for #676

1. Clone

2. Run `yarn`

3. Create a database on your local Postgres called `mikro_orm_test_gh_676`.

4. Run `yarn start`

Expected Output:

```

yarn start

yarn run v1.22.4

$ yarn build && node dist/index

$ webpack --config webpack.config.js

Hash: f682753770a1775d9bd9

Version: webpack 4.43.0

Time: 6222ms

Built at: 07/22/2020 11:28:29 AM

                                    Asset       Size  Chunks             Chunk Names

        ../lib/src/entities/location.d.ts  291 bytes          [emitted]

    ../lib/src/entities/location.d.ts.map  353 bytes          [emitted]

    ../lib/src/entities/organisation.d.ts  355 bytes          [emitted]

../lib/src/entities/organisation.d.ts.map  421 bytes          [emitted]

                    ../lib/src/index.d.ts   46 bytes          [emitted]

                ../lib/src/index.d.ts.map  107 bytes          [emitted]

                                 index.js   2.61 MiB    main  [emitted]  main

Entrypoint main = index.js

[./node_modules/@mikro-orm/core/metadata sync recursive] ./node_modules/@mikro-orm/core/metadata sync 160 bytes {main} [built]

[./node_modules/@mikro-orm/core/utils sync recursive] ./node_modules/@mikro-orm/core/utils sync 160 bytes {main} [built]

[./node_modules/@mikro-orm/core/utils sync recursive ^.*\/package\.json$] ./node_modules/@mikro-orm/core/utils sync ^.*\/package\.json$ 160 bytes {main} [built]

[./src/entities/location.ts] 1.43 KiB {main} [built]

[./src/entities/organisation.ts] 1.84 KiB {main} [built]

[./src/index.ts] 1.36 KiB {main} [built]

[assert] external "assert" 42 bytes {main} [built]

[crypto] external "crypto" 42 bytes {main} [built]

[domain] external "domain" 42 bytes {main} [built]

[fs] external "fs" 42 bytes {main} [built]

[module] external "module" 42 bytes {main} [built]

[path] external "path" 42 bytes {main} [built]

[stream] external "stream" 42 bytes {main} [built]

[url] external "url" 42 bytes {main} [built]

[util] external "util" 42 bytes {main} [built]

    + 457 hidden modules

WARNING in ./node_modules/@mikro-orm/core/utils/ConfigurationLoader.js 56:29-50

Critical dependency: the request of a dependency is an expression

 @ ./node_modules/@mikro-orm/core/utils/index.js

 @ ./node_modules/@mikro-orm/core/index.js

 @ ./src/index.ts

WARNING in ./node_modules/@mikro-orm/core/metadata/JavaScriptMetadataProvider.js 48:27-40

Critical dependency: the request of a dependency is an expression

 @ ./node_modules/@mikro-orm/core/metadata/index.js

 @ ./node_modules/@mikro-orm/core/index.js

 @ ./src/index.ts

WARNING in ./node_modules/@mikro-orm/core/utils/Utils.js 360:16-34

require.extensions is not supported by webpack. Use a loader instead.

 @ ./node_modules/@mikro-orm/core/utils/index.js 16:13-31

 @ ./node_modules/@mikro-orm/core/index.js

 @ ./src/index.ts

WARNING in ./node_modules/@mikro-orm/core/utils/Utils.js 360:40-58

require.extensions is not supported by webpack. Use a loader instead.

 @ ./node_modules/@mikro-orm/core/utils/index.js 16:13-31

 @ ./node_modules/@mikro-orm/core/index.js

 @ ./src/index.ts

Running init

MikroORM.init() took 1.163 seconds.

Adding new organisation...

TypeError: Cannot read property '__meta' of undefined

    at new Reference (webpack:///./node_modules/@mikro-orm/core/entity/Reference.js?:10:17)

    at Function.create (webpack:///./node_modules/@mikro-orm/core/entity/Reference.js?:29:16)

    at Function.wrapReference (webpack:///./node_modules/@mikro-orm/core/utils/Utils.js?:409:39)

    at Organisation.set [as location] (webpack:///./node_modules/@mikro-orm/core/entity/EntityHelper.js?:99:56)

    at UnitOfWork.fixMissingReference (/Users/kevin/development/mikro-676/node_modules/@mikro-orm/core/unit-of-work/UnitOfWork.js:376:31)

    at UnitOfWork.cascadeReference (/Users/kevin/development/mikro-676/node_modules/@mikro-orm/core/unit-of-work/UnitOfWork.js:325:14)

    at UnitOfWork.cascade (/Users/kevin/development/mikro-676/node_modules/@mikro-orm/core/unit-of-work/UnitOfWork.js:321:18)

    at UnitOfWork.persist (/Users/kevin/development/mikro-676/node_modules/@mikro-orm/core/unit-of-work/UnitOfWork.js:110:14)

    at SqlEntityManager.persist (/Users/kevin/development/mikro-676/node_modules/@mikro-orm/core/EntityManager.js:307:34)

    at SqlEntityManager.persistAndFlush (/Users/kevin/development/mikro-676/node_modules/@mikro-orm/core/EntityManager.js:316:20)

error Command failed with exit code 1.

```

## Profiling

Because `MikroORM.init` is taking quite a while, I've added 0x to profile what's taking so long. It looks like about half the time in init is

spent in highlight.js, while the other half is spent getting a database connection, and the rest is not worth optimising because it's so small.

To run profiling locally after doing the steps above, run `yarn profile`. This should run then generate and open a flamegraph in your browser.

[Here's an example flame graph.](https://htmlpreview.github.io/?https://raw.githubusercontent.com/thekevinbrown/mikro-676/master/flamegraph/index.html)