design-patterns – Page 11 – Türker Yıldırım

Static return type, and the fluent interface that inherits

NoteMarch 26, 20212 min read

A fluent method returning self tells the analyser the base class, so every chained call on a subclass loses its type after the first link. static as a…

A read model that is allowed to be wrong for four seconds

Deep diveMarch 17, 202114 min read

A report query with eleven joins, run on every dashboard load. One model cannot be shaped for both writing and reading past a certain size.

Domain events are past tense, always

NoteMarch 3, 20212 min read

An event names something that has already happened and cannot be refused, which is the property that separates it from a command. The naming convention is not cosmetic…

An OpenAPI document that is the test suite’s source of truth

Deep diveFebruary 23, 202110 min read

3.1 lands in February with real JSON Schema. Generating docs from code fixes half the problem; making the document the contract fixes the other half.

The N+1 that only appeared in the API serialiser

Deep diveFebruary 14, 202110 min read

A controller with eager loading and four hundred queries anyway, because the query count depends on which fields the client asked for.

A queue worker that stops cleanly

Deep diveFebruary 11, 202110 min read

A deploy killed a worker mid-job and a customer was charged without an order. SIGTERM, a grace period that was too short, and the job that must be…

A repository returning a query builder is not a repository

NoteJanuary 5, 20212 min read

A repository is a collection-like interface over persisted objects, and returning a query builder makes every caller a co-author of the persistence layer. The builder version cannot be…

Named arguments and attributes change how a framework is written

Deep diveDecember 29, 202010 min read

Two 8.0 features that look like syntax and are not. One makes optional parameters part of the API; the other makes docblocks executable.

An attribute is a class, and reading one is reflection

NoteDecember 23, 20202 min read

Docblock annotations were parsed from a comment by a library, which meant a typo was silent and an IDE could not help. An attribute is a real class…

Union types, promotion, and match

Deep diveDecember 18, 202015 min read

8.0 shipped in November with three changes that alter how a class is written, and a fourth that quietly breaks string-to-number comparison.