Only the code prior to and including the `yield` statement is executed before creating a response:

```Python hl_lines="2-4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

The yielded value is what is injected into *path operations* and other dependencies:

```Python hl_lines="4"
{!../../../docs_src/dependencies/tutorial007.py!}
```

The code following the `yield` statement is executed after the response has been delivered:

import (
	"reflect"

	"gorm.io/gorm/clause"
	"gorm.io/gorm/schema"
)

// Migrator returns migrator
func (db *DB) Migrator() Migrator {
	tx := db.getInstance()

	// apply scopes to migrator
	for len(tx.Statement.scopes) > 0 {
		tx = tx.executeScopes()
	}

	return tx.Dialector.Migrator(tx.Session(&Session{}))
}

// AutoMigrate run auto migration for given models
func (db *DB) AutoMigrate(dst ...interface{}) error {

.command }} {{- end }} {{- end }} minio/templates/_helper_policy.tpl {{- $statements_length := len .statements -}} {{- $statements_length := sub $statements_length 1 -}} { "Version": "2012-10-17", "Statement": [ {{- range $i, $statement := .statements }} { "Effect": "{{ $statement.effect | default "Allow" }}", "Action": [ "{{ $statement.actions | join "\",\n\"" }}" ]{{ if $statement.resources }}, "Resource": [ "{{ $statement.resources | join "\",\n\"" }}" ]{{ end }} {{- if $statement.conditions }}...

     * climbing up the syntax tree, passing control back and forth between the
     * two.
     *
     * Whether an expression is used is defined by the context in which it
     * appears. E.g. a "statement" in a block is considered used if it is the
     * last expression in that block AND the block itself is used -- a
     * recursive call to `isUsed`, one level higher in the syntax tree.
     *

type Dialector interface {
	Name() string
	Initialize(*DB) error
	Migrator(db *DB) Migrator
	DataTypeOf(*schema.Field) string
	DefaultValueOf(*schema.Field) clause.Expression
	BindVarTo(writer clause.Writer, stmt *Statement, v interface{})
	QuoteTo(clause.Writer, string)
	Explain(sql string, vars ...interface{}) string
}

// Plugin GORM plugin interface
type Plugin interface {
	Name() string
	Initialize(*DB) error
}

.command }} {{- end }} {{- end }} minio/templates/_helper_policy.tpl {{- $statements_length := len .statements -}} {{- $statements_length := sub $statements_length 1 -}} { "Version": "2012-10-17", "Statement": [ {{- range $i, $statement := .statements }} { "Effect": "{{ $statement.effect | default "Allow" }}", "Action": [ "{{ $statement.actions | join "\",\n\"" }}" ]{{ if $statement.resources }}, "Resource": [ "{{ $statement.resources | join "\",\n\"" }}" ]{{ end }} {{- if $statement.conditions }}...

.command }} {{- end }} {{- end }} minio/templates/_helper_policy.tpl {{- $statements_length := len .statements -}} {{- $statements_length := sub $statements_length 1 -}} { "Version": "2012-10-17", "Statement": [ {{- range $i, $statement := .statements }} { "Effect": "{{ $statement.effect | default "Allow" }}", "Action": [ "{{ $statement.actions | join "\",\n\"" }}" ]{{ if $statement.resources }}, "Resource": [ "{{ $statement.resources | join "\",\n\"" }}" ]{{ end }} {{- if $statement.conditions }}...

{{- end }} {{- end }} minio/templates/_helper_policy.tpl {{- $statements_length := len .statements -}} {{- $statements_length := sub $statements_length 1 -}} { "Version": "2012-10-17", "Statement": [ {{- range $i, $statement := .statements }} { "Effect": "Allow", "Action": [ "{{ $statement.actions | join "\",\n\"" }}" ]{{ if $statement.resources }}, "Resource": [ "{{ $statement.resources | join "\",\n\"" }}" ]{{ end }} {{- if $statement.conditions }} {{- $condition_len := len $statement.conditions...

	if err != nil {
		c.Fatalf("bucket creat error: %v", err)
	}

	// Create a policy policy
	policy := "mypolicy"
	policyBytes := []byte(fmt.Sprintf(`{
 "Version": "2012-10-17",
 "Statement": [
  {
   "Effect": "Allow",
   "Action": [
    "s3:PutObject",
    "s3:GetObject",
    "s3:ListBucket"
   ],
   "Resource": [
    "arn:aws:s3:::%s/*"
   ]
  }
 ]
}`, bucket))

* Hooks (Before/After Create/Save/Update/Delete/Find)
* Eager loading with `Preload`, `Joins`
* Transactions, Nested Transactions, Save Point, RollbackTo to Saved Point
* Context, Prepared Statement Mode, DryRun Mode
* Batch Insert, FindInBatches, Find To Map
* SQL Builder, Upsert, Locking, Optimizer/Index/Comment Hints, NamedArg, Search/Update/Create with SQL Expr
* Composite Primary Key
* Auto Migrations
* Logger