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DstructDB.go
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DstructDB.go
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// generated by stacks/gong/go/models/orm_file_per_struct_back_repo.go
package orm
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"sort"
"time"
"gorm.io/gorm"
"github.com/tealeg/xlsx/v3"
"github.com/fullstack-lang/gong/test/go/models"
)
// dummy variable to have the import declaration wihthout compile failure (even if no code needing this import is generated)
var dummy_Dstruct_sql sql.NullBool
var dummy_Dstruct_time time.Duration
var dummy_Dstruct_sort sort.Float64Slice
// DstructAPI is the input in POST API
//
// for POST, API, one needs the fields of the model as well as the fields
// from associations ("Has One" and "Has Many") that are generated to
// fullfill the ORM requirements for associations
//
// swagger:model dstructAPI
type DstructAPI struct {
gorm.Model
models.Dstruct_WOP
// encoding of pointers
// for API, it cannot be embedded
DstructPointersEncoding DstructPointersEncoding
}
// DstructPointersEncoding encodes pointers to Struct and
// reverse pointers of slice of poitners to Struct
type DstructPointersEncoding struct {
// insertion for pointer fields encoding declaration
// field Anarrayofb is a slice of pointers to another Struct (optional or 0..1)
Anarrayofb IntSlice `gorm:"type:TEXT"`
}
// DstructDB describes a dstruct in the database
//
// It incorporates the GORM ID, basic fields from the model (because they can be serialized),
// the encoded version of pointers
//
// swagger:model dstructDB
type DstructDB struct {
gorm.Model
// insertion for basic fields declaration
// Declation for basic field dstructDB.Name
Name_Data sql.NullString
// encoding of pointers
// for GORM serialization, it is necessary to embed to Pointer Encoding declaration
DstructPointersEncoding
}
// DstructDBs arrays dstructDBs
// swagger:response dstructDBsResponse
type DstructDBs []DstructDB
// DstructDBResponse provides response
// swagger:response dstructDBResponse
type DstructDBResponse struct {
DstructDB
}
// DstructWOP is a Dstruct without pointers (WOP is an acronym for "Without Pointers")
// it holds the same basic fields but pointers are encoded into uint
type DstructWOP struct {
ID int `xlsx:"0"`
// insertion for WOP basic fields
Name string `xlsx:"1"`
// insertion for WOP pointer fields
}
var Dstruct_Fields = []string{
// insertion for WOP basic fields
"ID",
"Name",
}
type BackRepoDstructStruct struct {
// stores DstructDB according to their gorm ID
Map_DstructDBID_DstructDB map[uint]*DstructDB
// stores DstructDB ID according to Dstruct address
Map_DstructPtr_DstructDBID map[*models.Dstruct]uint
// stores Dstruct according to their gorm ID
Map_DstructDBID_DstructPtr map[uint]*models.Dstruct
db *gorm.DB
stage *models.StageStruct
}
func (backRepoDstruct *BackRepoDstructStruct) GetStage() (stage *models.StageStruct) {
stage = backRepoDstruct.stage
return
}
func (backRepoDstruct *BackRepoDstructStruct) GetDB() *gorm.DB {
return backRepoDstruct.db
}
// GetDstructDBFromDstructPtr is a handy function to access the back repo instance from the stage instance
func (backRepoDstruct *BackRepoDstructStruct) GetDstructDBFromDstructPtr(dstruct *models.Dstruct) (dstructDB *DstructDB) {
id := backRepoDstruct.Map_DstructPtr_DstructDBID[dstruct]
dstructDB = backRepoDstruct.Map_DstructDBID_DstructDB[id]
return
}
// BackRepoDstruct.CommitPhaseOne commits all staged instances of Dstruct to the BackRepo
// Phase One is the creation of instance in the database if it is not yet done to get the unique ID for each staged instance
func (backRepoDstruct *BackRepoDstructStruct) CommitPhaseOne(stage *models.StageStruct) (Error error) {
for dstruct := range stage.Dstructs {
backRepoDstruct.CommitPhaseOneInstance(dstruct)
}
// parse all backRepo instance and checks wether some instance have been unstaged
// in this case, remove them from the back repo
for id, dstruct := range backRepoDstruct.Map_DstructDBID_DstructPtr {
if _, ok := stage.Dstructs[dstruct]; !ok {
backRepoDstruct.CommitDeleteInstance(id)
}
}
return
}
// BackRepoDstruct.CommitDeleteInstance commits deletion of Dstruct to the BackRepo
func (backRepoDstruct *BackRepoDstructStruct) CommitDeleteInstance(id uint) (Error error) {
dstruct := backRepoDstruct.Map_DstructDBID_DstructPtr[id]
// dstruct is not staged anymore, remove dstructDB
dstructDB := backRepoDstruct.Map_DstructDBID_DstructDB[id]
query := backRepoDstruct.db.Unscoped().Delete(&dstructDB)
if query.Error != nil {
log.Fatal(query.Error)
}
// update stores
delete(backRepoDstruct.Map_DstructPtr_DstructDBID, dstruct)
delete(backRepoDstruct.Map_DstructDBID_DstructPtr, id)
delete(backRepoDstruct.Map_DstructDBID_DstructDB, id)
return
}
// BackRepoDstruct.CommitPhaseOneInstance commits dstruct staged instances of Dstruct to the BackRepo
// Phase One is the creation of instance in the database if it is not yet done to get the unique ID for each staged instance
func (backRepoDstruct *BackRepoDstructStruct) CommitPhaseOneInstance(dstruct *models.Dstruct) (Error error) {
// check if the dstruct is not commited yet
if _, ok := backRepoDstruct.Map_DstructPtr_DstructDBID[dstruct]; ok {
return
}
// initiate dstruct
var dstructDB DstructDB
dstructDB.CopyBasicFieldsFromDstruct(dstruct)
query := backRepoDstruct.db.Create(&dstructDB)
if query.Error != nil {
log.Fatal(query.Error)
}
// update stores
backRepoDstruct.Map_DstructPtr_DstructDBID[dstruct] = dstructDB.ID
backRepoDstruct.Map_DstructDBID_DstructPtr[dstructDB.ID] = dstruct
backRepoDstruct.Map_DstructDBID_DstructDB[dstructDB.ID] = &dstructDB
return
}
// BackRepoDstruct.CommitPhaseTwo commits all staged instances of Dstruct to the BackRepo
// Phase Two is the update of instance with the field in the database
func (backRepoDstruct *BackRepoDstructStruct) CommitPhaseTwo(backRepo *BackRepoStruct) (Error error) {
for idx, dstruct := range backRepoDstruct.Map_DstructDBID_DstructPtr {
backRepoDstruct.CommitPhaseTwoInstance(backRepo, idx, dstruct)
}
return
}
// BackRepoDstruct.CommitPhaseTwoInstance commits {{structname }} of models.Dstruct to the BackRepo
// Phase Two is the update of instance with the field in the database
func (backRepoDstruct *BackRepoDstructStruct) CommitPhaseTwoInstance(backRepo *BackRepoStruct, idx uint, dstruct *models.Dstruct) (Error error) {
// fetch matching dstructDB
if dstructDB, ok := backRepoDstruct.Map_DstructDBID_DstructDB[idx]; ok {
dstructDB.CopyBasicFieldsFromDstruct(dstruct)
// insertion point for translating pointers encodings into actual pointers
// 1. reset
dstructDB.DstructPointersEncoding.Anarrayofb = make([]int, 0)
// 2. encode
for _, bstructAssocEnd := range dstruct.Anarrayofb {
bstructAssocEnd_DB :=
backRepo.BackRepoBstruct.GetBstructDBFromBstructPtr(bstructAssocEnd)
// the stage might be inconsistant, meaning that the bstructAssocEnd_DB might
// be missing from the stage. In this case, the commit operation is robust
// An alternative would be to crash here to reveal the missing element.
if bstructAssocEnd_DB == nil {
continue
}
dstructDB.DstructPointersEncoding.Anarrayofb =
append(dstructDB.DstructPointersEncoding.Anarrayofb, int(bstructAssocEnd_DB.ID))
}
query := backRepoDstruct.db.Save(&dstructDB)
if query.Error != nil {
log.Fatalln(query.Error)
}
} else {
err := errors.New(
fmt.Sprintf("Unkown Dstruct intance %s", dstruct.Name))
return err
}
return
}
// BackRepoDstruct.CheckoutPhaseOne Checkouts all BackRepo instances to the Stage
//
// Phase One will result in having instances on the stage aligned with the back repo
// pointers are not initialized yet (this is for phase two)
func (backRepoDstruct *BackRepoDstructStruct) CheckoutPhaseOne() (Error error) {
dstructDBArray := make([]DstructDB, 0)
query := backRepoDstruct.db.Find(&dstructDBArray)
if query.Error != nil {
return query.Error
}
// list of instances to be removed
// start from the initial map on the stage and remove instances that have been checked out
dstructInstancesToBeRemovedFromTheStage := make(map[*models.Dstruct]any)
for key, value := range backRepoDstruct.stage.Dstructs {
dstructInstancesToBeRemovedFromTheStage[key] = value
}
// copy orm objects to the the map
for _, dstructDB := range dstructDBArray {
backRepoDstruct.CheckoutPhaseOneInstance(&dstructDB)
// do not remove this instance from the stage, therefore
// remove instance from the list of instances to be be removed from the stage
dstruct, ok := backRepoDstruct.Map_DstructDBID_DstructPtr[dstructDB.ID]
if ok {
delete(dstructInstancesToBeRemovedFromTheStage, dstruct)
}
}
// remove from stage and back repo's 3 maps all dstructs that are not in the checkout
for dstruct := range dstructInstancesToBeRemovedFromTheStage {
dstruct.Unstage(backRepoDstruct.GetStage())
// remove instance from the back repo 3 maps
dstructID := backRepoDstruct.Map_DstructPtr_DstructDBID[dstruct]
delete(backRepoDstruct.Map_DstructPtr_DstructDBID, dstruct)
delete(backRepoDstruct.Map_DstructDBID_DstructDB, dstructID)
delete(backRepoDstruct.Map_DstructDBID_DstructPtr, dstructID)
}
return
}
// CheckoutPhaseOneInstance takes a dstructDB that has been found in the DB, updates the backRepo and stages the
// models version of the dstructDB
func (backRepoDstruct *BackRepoDstructStruct) CheckoutPhaseOneInstance(dstructDB *DstructDB) (Error error) {
dstruct, ok := backRepoDstruct.Map_DstructDBID_DstructPtr[dstructDB.ID]
if !ok {
dstruct = new(models.Dstruct)
backRepoDstruct.Map_DstructDBID_DstructPtr[dstructDB.ID] = dstruct
backRepoDstruct.Map_DstructPtr_DstructDBID[dstruct] = dstructDB.ID
// append model store with the new element
dstruct.Name = dstructDB.Name_Data.String
dstruct.Stage(backRepoDstruct.GetStage())
}
dstructDB.CopyBasicFieldsToDstruct(dstruct)
// in some cases, the instance might have been unstaged. It is necessary to stage it again
dstruct.Stage(backRepoDstruct.GetStage())
// preserve pointer to dstructDB. Otherwise, pointer will is recycled and the map of pointers
// Map_DstructDBID_DstructDB)[dstructDB hold variable pointers
dstructDB_Data := *dstructDB
preservedPtrToDstruct := &dstructDB_Data
backRepoDstruct.Map_DstructDBID_DstructDB[dstructDB.ID] = preservedPtrToDstruct
return
}
// BackRepoDstruct.CheckoutPhaseTwo Checkouts all staged instances of Dstruct to the BackRepo
// Phase Two is the update of instance with the field in the database
func (backRepoDstruct *BackRepoDstructStruct) CheckoutPhaseTwo(backRepo *BackRepoStruct) (Error error) {
// parse all DB instance and update all pointer fields of the translated models instance
for _, dstructDB := range backRepoDstruct.Map_DstructDBID_DstructDB {
backRepoDstruct.CheckoutPhaseTwoInstance(backRepo, dstructDB)
}
return
}
// BackRepoDstruct.CheckoutPhaseTwoInstance Checkouts staged instances of Dstruct to the BackRepo
// Phase Two is the update of instance with the field in the database
func (backRepoDstruct *BackRepoDstructStruct) CheckoutPhaseTwoInstance(backRepo *BackRepoStruct, dstructDB *DstructDB) (Error error) {
dstruct := backRepoDstruct.Map_DstructDBID_DstructPtr[dstructDB.ID]
dstructDB.DecodePointers(backRepo, dstruct)
return
}
func (dstructDB *DstructDB) DecodePointers(backRepo *BackRepoStruct, dstruct *models.Dstruct) {
// insertion point for checkout of pointer encoding
// This loop redeem dstruct.Anarrayofb in the stage from the encode in the back repo
// It parses all BstructDB in the back repo and if the reverse pointer encoding matches the back repo ID
// it appends the stage instance
// 1. reset the slice
dstruct.Anarrayofb = dstruct.Anarrayofb[:0]
for _, _Bstructid := range dstructDB.DstructPointersEncoding.Anarrayofb {
dstruct.Anarrayofb = append(dstruct.Anarrayofb, backRepo.BackRepoBstruct.Map_BstructDBID_BstructPtr[uint(_Bstructid)])
}
return
}
// CommitDstruct allows commit of a single dstruct (if already staged)
func (backRepo *BackRepoStruct) CommitDstruct(dstruct *models.Dstruct) {
backRepo.BackRepoDstruct.CommitPhaseOneInstance(dstruct)
if id, ok := backRepo.BackRepoDstruct.Map_DstructPtr_DstructDBID[dstruct]; ok {
backRepo.BackRepoDstruct.CommitPhaseTwoInstance(backRepo, id, dstruct)
}
backRepo.CommitFromBackNb = backRepo.CommitFromBackNb + 1
}
// CommitDstruct allows checkout of a single dstruct (if already staged and with a BackRepo id)
func (backRepo *BackRepoStruct) CheckoutDstruct(dstruct *models.Dstruct) {
// check if the dstruct is staged
if _, ok := backRepo.BackRepoDstruct.Map_DstructPtr_DstructDBID[dstruct]; ok {
if id, ok := backRepo.BackRepoDstruct.Map_DstructPtr_DstructDBID[dstruct]; ok {
var dstructDB DstructDB
dstructDB.ID = id
if err := backRepo.BackRepoDstruct.db.First(&dstructDB, id).Error; err != nil {
log.Fatalln("CheckoutDstruct : Problem with getting object with id:", id)
}
backRepo.BackRepoDstruct.CheckoutPhaseOneInstance(&dstructDB)
backRepo.BackRepoDstruct.CheckoutPhaseTwoInstance(backRepo, &dstructDB)
}
}
}
// CopyBasicFieldsFromDstruct
func (dstructDB *DstructDB) CopyBasicFieldsFromDstruct(dstruct *models.Dstruct) {
// insertion point for fields commit
dstructDB.Name_Data.String = dstruct.Name
dstructDB.Name_Data.Valid = true
}
// CopyBasicFieldsFromDstruct_WOP
func (dstructDB *DstructDB) CopyBasicFieldsFromDstruct_WOP(dstruct *models.Dstruct_WOP) {
// insertion point for fields commit
dstructDB.Name_Data.String = dstruct.Name
dstructDB.Name_Data.Valid = true
}
// CopyBasicFieldsFromDstructWOP
func (dstructDB *DstructDB) CopyBasicFieldsFromDstructWOP(dstruct *DstructWOP) {
// insertion point for fields commit
dstructDB.Name_Data.String = dstruct.Name
dstructDB.Name_Data.Valid = true
}
// CopyBasicFieldsToDstruct
func (dstructDB *DstructDB) CopyBasicFieldsToDstruct(dstruct *models.Dstruct) {
// insertion point for checkout of basic fields (back repo to stage)
dstruct.Name = dstructDB.Name_Data.String
}
// CopyBasicFieldsToDstruct_WOP
func (dstructDB *DstructDB) CopyBasicFieldsToDstruct_WOP(dstruct *models.Dstruct_WOP) {
// insertion point for checkout of basic fields (back repo to stage)
dstruct.Name = dstructDB.Name_Data.String
}
// CopyBasicFieldsToDstructWOP
func (dstructDB *DstructDB) CopyBasicFieldsToDstructWOP(dstruct *DstructWOP) {
dstruct.ID = int(dstructDB.ID)
// insertion point for checkout of basic fields (back repo to stage)
dstruct.Name = dstructDB.Name_Data.String
}
// Backup generates a json file from a slice of all DstructDB instances in the backrepo
func (backRepoDstruct *BackRepoDstructStruct) Backup(dirPath string) {
filename := filepath.Join(dirPath, "DstructDB.json")
// organize the map into an array with increasing IDs, in order to have repoductible
// backup file
forBackup := make([]*DstructDB, 0)
for _, dstructDB := range backRepoDstruct.Map_DstructDBID_DstructDB {
forBackup = append(forBackup, dstructDB)
}
sort.Slice(forBackup[:], func(i, j int) bool {
return forBackup[i].ID < forBackup[j].ID
})
file, err := json.MarshalIndent(forBackup, "", " ")
if err != nil {
log.Fatal("Cannot json Dstruct ", filename, " ", err.Error())
}
err = ioutil.WriteFile(filename, file, 0644)
if err != nil {
log.Fatal("Cannot write the json Dstruct file", err.Error())
}
}
// Backup generates a json file from a slice of all DstructDB instances in the backrepo
func (backRepoDstruct *BackRepoDstructStruct) BackupXL(file *xlsx.File) {
// organize the map into an array with increasing IDs, in order to have repoductible
// backup file
forBackup := make([]*DstructDB, 0)
for _, dstructDB := range backRepoDstruct.Map_DstructDBID_DstructDB {
forBackup = append(forBackup, dstructDB)
}
sort.Slice(forBackup[:], func(i, j int) bool {
return forBackup[i].ID < forBackup[j].ID
})
sh, err := file.AddSheet("Dstruct")
if err != nil {
log.Fatal("Cannot add XL file", err.Error())
}
_ = sh
row := sh.AddRow()
row.WriteSlice(&Dstruct_Fields, -1)
for _, dstructDB := range forBackup {
var dstructWOP DstructWOP
dstructDB.CopyBasicFieldsToDstructWOP(&dstructWOP)
row := sh.AddRow()
row.WriteStruct(&dstructWOP, -1)
}
}
// RestoreXL from the "Dstruct" sheet all DstructDB instances
func (backRepoDstruct *BackRepoDstructStruct) RestoreXLPhaseOne(file *xlsx.File) {
// resets the map
BackRepoDstructid_atBckpTime_newID = make(map[uint]uint)
sh, ok := file.Sheet["Dstruct"]
_ = sh
if !ok {
log.Fatal(errors.New("sheet not found"))
}
// log.Println("Max row is", sh.MaxRow)
err := sh.ForEachRow(backRepoDstruct.rowVisitorDstruct)
if err != nil {
log.Fatal("Err=", err)
}
}
func (backRepoDstruct *BackRepoDstructStruct) rowVisitorDstruct(row *xlsx.Row) error {
log.Printf("row line %d\n", row.GetCoordinate())
log.Println(row)
// skip first line
if row.GetCoordinate() > 0 {
var dstructWOP DstructWOP
row.ReadStruct(&dstructWOP)
// add the unmarshalled struct to the stage
dstructDB := new(DstructDB)
dstructDB.CopyBasicFieldsFromDstructWOP(&dstructWOP)
dstructDB_ID_atBackupTime := dstructDB.ID
dstructDB.ID = 0
query := backRepoDstruct.db.Create(dstructDB)
if query.Error != nil {
log.Fatal(query.Error)
}
backRepoDstruct.Map_DstructDBID_DstructDB[dstructDB.ID] = dstructDB
BackRepoDstructid_atBckpTime_newID[dstructDB_ID_atBackupTime] = dstructDB.ID
}
return nil
}
// RestorePhaseOne read the file "DstructDB.json" in dirPath that stores an array
// of DstructDB and stores it in the database
// the map BackRepoDstructid_atBckpTime_newID is updated accordingly
func (backRepoDstruct *BackRepoDstructStruct) RestorePhaseOne(dirPath string) {
// resets the map
BackRepoDstructid_atBckpTime_newID = make(map[uint]uint)
filename := filepath.Join(dirPath, "DstructDB.json")
jsonFile, err := os.Open(filename)
// if we os.Open returns an error then handle it
if err != nil {
log.Fatal("Cannot restore/open the json Dstruct file", filename, " ", err.Error())
}
// read our opened jsonFile as a byte array.
byteValue, _ := ioutil.ReadAll(jsonFile)
var forRestore []*DstructDB
err = json.Unmarshal(byteValue, &forRestore)
// fill up Map_DstructDBID_DstructDB
for _, dstructDB := range forRestore {
dstructDB_ID_atBackupTime := dstructDB.ID
dstructDB.ID = 0
query := backRepoDstruct.db.Create(dstructDB)
if query.Error != nil {
log.Fatal(query.Error)
}
backRepoDstruct.Map_DstructDBID_DstructDB[dstructDB.ID] = dstructDB
BackRepoDstructid_atBckpTime_newID[dstructDB_ID_atBackupTime] = dstructDB.ID
}
if err != nil {
log.Fatal("Cannot restore/unmarshall json Dstruct file", err.Error())
}
}
// RestorePhaseTwo uses all map BackRepo<Dstruct>id_atBckpTime_newID
// to compute new index
func (backRepoDstruct *BackRepoDstructStruct) RestorePhaseTwo() {
for _, dstructDB := range backRepoDstruct.Map_DstructDBID_DstructDB {
// next line of code is to avert unused variable compilation error
_ = dstructDB
// insertion point for reindexing pointers encoding
// update databse with new index encoding
query := backRepoDstruct.db.Model(dstructDB).Updates(*dstructDB)
if query.Error != nil {
log.Fatal(query.Error)
}
}
}
// BackRepoDstruct.ResetReversePointers commits all staged instances of Dstruct to the BackRepo
// Phase Two is the update of instance with the field in the database
func (backRepoDstruct *BackRepoDstructStruct) ResetReversePointers(backRepo *BackRepoStruct) (Error error) {
for idx, dstruct := range backRepoDstruct.Map_DstructDBID_DstructPtr {
backRepoDstruct.ResetReversePointersInstance(backRepo, idx, dstruct)
}
return
}
func (backRepoDstruct *BackRepoDstructStruct) ResetReversePointersInstance(backRepo *BackRepoStruct, idx uint, dstruct *models.Dstruct) (Error error) {
// fetch matching dstructDB
if dstructDB, ok := backRepoDstruct.Map_DstructDBID_DstructDB[idx]; ok {
_ = dstructDB // to avoid unused variable error if there are no reverse to reset
// insertion point for reverse pointers reset
// end of insertion point for reverse pointers reset
}
return
}
// this field is used during the restauration process.
// it stores the ID at the backup time and is used for renumbering
var BackRepoDstructid_atBckpTime_newID map[uint]uint