README
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datastore-transformer
Library to apply transformations over Google Datastore entities
⚠ This repo is not stable yet: Be careful!
Example
Remove field OldField and add field NewField with value 1 to all entities of kind KindToTransform
package main
import (
"cloud.google.com/go/datastore"
"context"
"github.com/rbcervilla/datastore-transformer"
)
func main() {
ctx := context.Background()
cli, _ := datastore.NewClient(ctx, "project-id")
tr, _ := transformer.New(cli, datastore.NewQuery("KindToTransform"))
tr.Apply(
transformer.RemoveField("OldField"),
transformer.SetField("NewField", 1, true))
tr.Do(ctx)
}
Documentation
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Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Doer ¶
type Doer struct {
// contains filtered or unexported fields
}
Doer runs the query and sends to the workers the entities to transform and save.
func (*Doer) Apply ¶
func (d *Doer) Apply(t ...Transformer)
Apply adds Transformer to be applied to an Entity
type Entity ¶
type Entity struct {
Properties map[string]datastore.Property
// contains filtered or unexported fields
}
Entity contains key and properties of a datastore entity
Implements datastore.KeyLoader in order to Load and Save the entity.
type Option ¶
Option is a functional option for configuring the Doer
func WithConcurrency ¶
WithConcurrency function to set numer of workers running concurrently
func WithFailOnError ¶
type Transformer ¶
Transformer is the interface that wraps methos Transform
Transform performs transformations on the Entity
type TransformerFunc ¶
TransformerFunc type is an adapter to allow the use of functions as Transformer
func RemoveField ¶
func RemoveField(field string) TransformerFunc
RemoveField returns a TransformerFunc that remove field of the Entity
func SetField ¶
func SetField(field string, value interface{}, index bool) TransformerFunc
SetField returns a TransformerFunc that sets a field to the Entity
func (TransformerFunc) Transform ¶
func (f TransformerFunc) Transform(e *Entity) error
Source Files