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crud_repository.go
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crud_repository.go
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package gorm_crud
import (
"database/sql"
"errors"
"fmt"
"github.com/lib/pq"
"reflect"
"strconv"
"strings"
"time"
"github.com/jinzhu/gorm"
)
type ListParametersInterface interface{}
type PaginationParameters struct {
Page int `form:"page,default=0" json:"page,default=0"`
PageSize int `form:"page_size,default=30" json:"page_size,default=30"`
OrderBy string `form:"order_by,default=id" json:"order_by,default=id"`
OrderDesc bool `form:"order_desc,default=false" json:"order_desc,default=false"`
}
type CrudListParameters struct {
*PaginationParameters
}
const DefaultPageSize = 30
type ListQueryBuilderInterface interface {
ListQuery(parameters ListParametersInterface) (*gorm.DB, error)
}
type BaseListQueryBuilder struct {
Db *gorm.DB
Logger LoggerInterface
ListQueryBuilderInterface
}
func NewBaseListQueryBuilder(db *gorm.DB, logger LoggerInterface) *BaseListQueryBuilder {
return &BaseListQueryBuilder{Db: db, Logger: logger}
}
func (c BaseListQueryBuilder) paginationQuery(parameters ListParametersInterface) *gorm.DB {
query := c.Db
val := reflect.ValueOf(parameters).Elem()
if val.Kind() != reflect.Struct {
c.Logger.Error("gorm-crud: Unexpected type of parameters for paginationQuery")
return query
}
paginationParameters := val.FieldByName("PaginationParameters")
hasPaginationParams := paginationParameters.IsValid() && !paginationParameters.IsNil()
var page int64
page = 0
if hasPaginationParams {
pageValue := val.FieldByName("Page")
if !pageValue.IsValid() || pageValue.Kind() != reflect.Int {
c.Logger.Error("gorm-crud: Page is not specified correctly in listQuery")
} else {
page = pageValue.Int()
}
}
var pageSize int64
pageSize = DefaultPageSize
if hasPaginationParams {
pageSizeValue := val.FieldByName("PageSize")
if !pageSizeValue.IsValid() || pageSizeValue.Kind() != reflect.Int {
c.Logger.Error("gorm-crud: PageSize is not specified in listQuery")
} else {
pageSize = pageSizeValue.Int()
}
}
limit := pageSize
offset := page * pageSize
query = query.Offset(offset).Limit(limit)
var orderBy string
if hasPaginationParams {
orderByValue := val.FieldByName("OrderBy")
if orderByValue.IsValid() && orderByValue.Kind() == reflect.String {
orderBy = orderByValue.String()
}
}
var orderDesc = false
if hasPaginationParams {
orderDescValue := val.FieldByName("OrderDesc")
if orderDescValue.IsValid() && orderDescValue.Kind() == reflect.Bool {
orderDesc = orderDescValue.Bool()
}
}
if len(orderBy) > 0 {
if orderDesc {
query = query.Order(fmt.Sprintf("%s DESC", orderBy), true)
} else {
query = query.Order(fmt.Sprintf("%s ASC", orderBy), true)
}
}
return query
}
func (c BaseListQueryBuilder) ListQuery(parameters ListParametersInterface) (*gorm.DB, error) {
return c.paginationQuery(parameters), nil
}
type CrudRepositoryInterface interface {
BaseRepositoryInterface
GetModel() InterfaceEntity
Find(id uint) (InterfaceEntity, error)
PluckBy(fieldNames []string) (map[string]int64, error)
ListAll() ([]InterfaceEntity, error)
List(parameters ListParametersInterface) ([]InterfaceEntity, error)
ListCount(parameters ListParametersInterface) (int64, error)
Create(item InterfaceEntity) InterfaceEntity
CreateOrUpdateMany(item InterfaceEntity, columns []string, values []map[string]interface{}, onConflict string) error
Update(item InterfaceEntity) InterfaceEntity
Delete(id uint) error
}
type CrudRepository struct {
CrudRepositoryInterface
*BaseRepository
Model InterfaceEntity // Dynamic typing
ListQueryBuilder ListQueryBuilderInterface
}
func NewCrudRepository(db *gorm.DB, model InterfaceEntity, listQueryBuilder ListQueryBuilderInterface, logger LoggerInterface) *CrudRepository {
repo := NewBaseRepository(db, logger)
return &CrudRepository{
BaseRepository: repo,
Model: model,
ListQueryBuilder: listQueryBuilder,
}
}
func (c CrudRepository) GetModel() InterfaceEntity {
return c.Model
}
func (c CrudRepository) Find(id uint) (InterfaceEntity, error) {
item := reflect.New(reflect.TypeOf(c.GetModel()).Elem()).Interface()
err := c.Db.First(item, id).Error
return item, NormalizeErr(err)
}
func (c CrudRepository) PluckBy(fieldNames []string) (map[string]int64, error) {
res := map[string]int64{}
items, err := c.ListAll()
if nil != err {
return res, err
}
for _, item := range items {
// build key
values := make([]string, 0)
val := reflect.ValueOf(item)
for _, fieldName := range fieldNames {
if val.FieldByName(fieldName).IsValid() {
values = append(values, val.FieldByName(fieldName).String())
} else {
return res, fmt.Errorf("field with name (%s) does not exists on entity (%s)", fieldName, reflect.TypeOf(item))
}
}
pluckKey := strings.Join(values, "_")
res[pluckKey] = Num64(val.FieldByName("ID").Interface())
}
return res, err
}
func (c CrudRepository) ListAll() ([]InterfaceEntity, error) {
entities := make([]InterfaceEntity, 0)
page := 0
pageSize := 10000
for {
parameters := new(CrudListParameters)
parameters.PaginationParameters = new(PaginationParameters)
parameters.OrderBy = "id"
parameters.OrderDesc = false
parameters.PageSize = pageSize
parameters.Page = page
items, err := c.List(parameters)
if nil != err {
return entities, err
}
for _, item := range items {
entities = append(entities, item)
}
if len(items) < pageSize {
break
}
page += 1
}
return entities, nil
}
func (c CrudRepository) List(parameters ListParametersInterface) ([]InterfaceEntity, error) {
items := reflect.New(reflect.SliceOf(reflect.TypeOf(c.GetModel()).Elem())).Interface()
query, err := c.ListQueryBuilder.ListQuery(parameters)
if err != nil {
return []InterfaceEntity{}, err
}
err = query.Find(items).Error
entities := reflect.ValueOf(items).Elem().Interface()
// Convert entities to slice
var data []InterfaceEntity
sliceValue := reflect.ValueOf(entities)
for i := 0; i < sliceValue.Len(); i++ {
data = append(data, sliceValue.Index(i).Interface())
}
return data, NormalizeErr(err)
}
func (c CrudRepository) ListCount(parameters ListParametersInterface) (int64, error) {
query, err := c.ListQueryBuilder.ListQuery(parameters)
if err != nil {
return 0, err
}
var count int64
item := reflect.New(reflect.TypeOf(c.GetModel()).Elem()).Interface()
err = query.Model(item).Count(&count).Error
return count, err
}
func (c CrudRepository) Create(item InterfaceEntity) InterfaceEntity {
c.Db.Create(item)
return item
}
func (c *CrudRepository) quote(str string) string {
// postgres style escape
str = strings.ReplaceAll(str, "'", "''")
return fmt.Sprintf("'%s'", str)
}
func (c CrudRepository) prepareTime(val time.Time) string {
return fmt.Sprintf("'%s'", val.Format("2006-01-02T15:04:05-0700"))
}
func (c CrudRepository) prepareSliceOfNumbers(values interface{}) string {
result := "{}"
switch reflect.TypeOf(values).Kind() {
case reflect.Slice:
s := reflect.ValueOf(values)
valuesText := []string{}
for i := 0; i < s.Len(); i++ {
text := fmt.Sprint(s.Index(i))
valuesText = append(valuesText, text)
}
result = fmt.Sprintf("{%s}", strings.Join(valuesText, ","))
}
return c.quote(result)
}
// CreateOrUpdateMany create or update if exists
func (c CrudRepository) CreateOrUpdateMany(
item InterfaceEntity,
columns []string,
values []map[string]interface{},
onConflict string,
) error {
if len(values) == 0 {
return nil
}
tableName := c.Db.NewScope(item).TableName()
var valueStrings []string
for _, valueMap := range values {
var valueRowString []string
for _, column := range columns {
colVal, ok := valueMap[column]
if !ok {
return errors.New(fmt.Sprintf("CreateOrUpdateMany: value for column %s found, table: %s", column, tableName))
}
// stringify column value
val := fmt.Sprintf("%v", colVal)
// filter column value
switch v := colVal.(type) {
case sql.NullInt32:
if !v.Valid {
val = "NULL"
} else {
val = strconv.FormatInt(int64(v.Int32), 10)
}
case sql.NullInt64:
if !v.Valid {
val = "NULL"
} else {
val = strconv.FormatInt(v.Int64, 10)
}
case sql.NullFloat64:
if !v.Valid {
val = "NULL"
} else {
val = fmt.Sprintf("%g", v.Float64)
}
case sql.NullBool:
if !v.Valid {
val = "NULL"
} else if v.Bool {
val = "TRUE"
} else {
val = "FALSE"
}
case sql.NullTime:
if !v.Valid {
val = "NULL"
} else {
val = c.prepareTime(v.Time)
}
case sql.NullString:
if !v.Valid {
val = "NULL"
} else {
val = c.quote(v.String)
}
case time.Time:
val = c.prepareTime(colVal.(time.Time))
case *time.Time:
if !reflect.ValueOf(colVal).IsNil() {
t := reflect.ValueOf(colVal).Elem().Interface().(time.Time)
val = c.prepareTime(t)
} else {
val = "NULL"
}
case []int64, []int32, []uint8, []float64, []float32, pq.Int64Array, pq.Float64Array:
val = c.prepareSliceOfNumbers(v)
default:
if reflect.TypeOf(colVal).Kind() == reflect.String {
val = c.quote(val)
}
}
valueRowString = append(valueRowString, val)
}
valueString := fmt.Sprintf("(%s)", strings.Join(valueRowString, ","))
valueStrings = append(valueStrings, valueString)
}
query := fmt.Sprintf("INSERT INTO %s (%s) VALUES %s %s",
tableName,
strings.Join(columns, ","),
strings.Join(valueStrings, ","),
onConflict)
err := c.Db.Exec(query).Error
err = NormalizeErr(err)
if nil != err {
c.Logger.Errorf("gorm-crud: Error in the CreateOrUpdateMany(): %v, table: %s", err, tableName)
}
return err
}
func (c CrudRepository) Update(item InterfaceEntity) InterfaceEntity {
c.Db.Save(item)
return item
}
func (c CrudRepository) Delete(id uint) error {
item, err := c.Find(id)
err = NormalizeErr(err)
if err != nil {
return err
}
c.Db.Delete(item)
return nil
}