OnConstraint: "some_id_other_id_unique",
		UpdateAll:    true,
	}).Create(&thing2)
	if result.Error != nil {
		t.Errorf("creating second thing: %v", result.Error)
	}

	var things []Thing
	if err := DB.Find(&things).Error; err != nil {
		t.Errorf("Failed, got error: %v", err)
	}

	if len(things) > 1 {
		t.Errorf("expected 1 thing got more")
	}
}

type CompanyNew struct {
	ID   int
	Name int

* <a href="https://developers.liblab.com/tutorials/sdk-for-fastapi/?utm_source=fastapi" class="external-link" target="_blank">liblab</a>

There are also several other companies offering similar services that you can search and find online. 🤓

## Generate a TypeScript Frontend Client

Let's start with a simple FastAPI application:

//// tab | Python 3.9+

```Python hl_lines="7-9  12-13  16-17  21"

if "%MAVEN_HOME%"=="" goto error

:checkMCmd
if not exist "%MAVEN_HOME%\bin\mvn.cmd" goto error

@REM ==== END VALIDATION ====

:init

set "CLASSWORLDS_CONF=%MAVEN_HOME%\bin\m2.conf"

@REM Find the project basedir, i.e., the directory that contains the directory ".mvn".
@REM Fallback to current working directory if not found.

set "EXEC_DIR=%CD%"
set "WDIR=%EXEC_DIR%"

    for (ClassPath.ClassInfo classInfo : classes) {
      if (classInfo.getName().equals(cls.getName())) {
        return classInfo;
      }
    }
    throw new AssertionError("failed to find " + cls);
  }

  private static ResourceInfo resourceInfo(Class<?> cls) {
    String resource = cls.getName().replace('.', '/') + ".class";
    ClassLoader loader = cls.getClassLoader();

{\n    if (!document.documentElement.attachShadow) {\n      return null\n    }\n\n    // Can find the shadow root otherwise it'll return the document\n    if (typeof element.getRootNode === 'function') {\n      const root = element.getRootNode()\n      return root instanceof ShadowRoot ? root : null\n    }\n\n    if (element instanceof ShadowRoot) {\n      return element\n    }\n\n    // when we don't find a shadow root\n    if (!element.parentNode) {\n      return null\n    }\n\n    return Util....

- [Creating Fast and Lean Code](https://github.com/istio/istio/wiki/Writing-Fast-and-Lean-Code) - performance-oriented advice and guidelines for the code base

You'll find many other useful documents on our [Wiki](https://github.com/istio/istio/wiki).

## Introduction

[Istio](https://istio.io/latest/docs/concepts/what-is-istio/) is an open platform for providing a uniform way to [integrate

        nextInBucketKToV[prevInBucket] = nextInBucketKToV[entry];
        nextInBucketKToV[entry] = ABSENT;
        return;
      }
      prevInBucket = entryInBucket;
    }
    throw new AssertionError("Expected to find entry with key " + keys[entry]);
  }

  /**
   * Updates the V-to-K hash table to remove the entry at the specified index, which is assumed to
   * be present. Does not update any other data structures.
   */

        // this can be safely acquired after the acquiredLock.
        //
        // Note that there is a race condition here which can result in missing
        // a cyclic edge: it's possible for two threads to simultaneous find
        // "safe" edges which together form a cycle. Preventing this race
        // condition efficiently without _introducing_ deadlock is probably
        // tricky. For now, just accept the race condition---missing a warning

```

////

//// tab | Python 3.8+

```Python hl_lines="9"
{!> ../../docs_src/body_nested_models/tutorial009.py!}
```

////

/// tip

Keep in mind that JSON only supports `str` as keys.

But Pydantic has automatic data conversion.

		}
	}
	// Read until next line.
	in, err := r.buf.ReadBytes('\n')
	dst = append(dst, in...)
	return dst, err
}

// csvSplitSize is the size of each block.
// Blocks will read this much and find the first following newline.
// 128KB appears to be a very reasonable default.
const csvSplitSize = 128 << 10

// startReaders will read the header if needed and spin up a parser