/
companyloader.go
152 lines (127 loc) · 3.72 KB
/
companyloader.go
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package dataloader
import (
"time"
"github.com/kiwisheets/gql-server/dataloader/generated"
"github.com/kiwisheets/gql-server/orm/model"
"gorm.io/gorm"
)
func newCompanyByIDLoader(db *gorm.DB) *generated.CompanyLoader {
return generated.NewCompanyLoader(generated.CompanyLoaderConfig{
MaxBatch: 1000,
Wait: 1 * time.Millisecond,
Fetch: func(ids []int64) ([]*model.Company, []error) {
rows, err := db.Model(&model.Company{}).Where(ids).Rows()
if err != nil {
if rows == nil {
return nil, []error{err}
}
// log error
}
defer rows.Close()
companyByID := map[int64]*model.Company{}
for rows.Next() {
var company model.Company
db.ScanRows(rows, &company)
if company.ID == 0 {
// no value returned
} else {
companyByID[int64(company.ID)] = &company
}
}
orderedCompanies := make([]*model.Company, len(ids))
for i, id := range ids {
orderedCompanies[i] = companyByID[id]
i++
}
return orderedCompanies, nil
},
})
}
// TODO: Fix this, what is this
func newCompanyByUserIDLoader(db *gorm.DB) *generated.CompanyLoader {
return generated.NewCompanyLoader(generated.CompanyLoaderConfig{
MaxBatch: 1000,
Wait: 1 * time.Millisecond,
Fetch: func(userIDs []int64) ([]*model.Company, []error) {
// get users
userRows, err := db.Model(&model.User{}).Select("id, company_id").Where(userIDs).Rows()
if err != nil {
if userRows == nil {
return nil, []error{err}
}
}
defer userRows.Close()
// map user IDs to company IDs and company IDs to nil
// map to nil so that we only get unique companies from DB
companyIDbyUserID := map[int64]int64{}
companyByCompanyID := map[int64]*model.Company{}
for userRows.Next() {
var user model.User
db.ScanRows(userRows, &user)
companyIDbyUserID[int64(user.ID)] = int64(user.CompanyID)
companyByCompanyID[int64(user.CompanyID)] = nil
}
// convert map to slice of now unique company IDs
companyIDs := []int64{}
for id := range companyByCompanyID {
companyIDs = append(companyIDs, id)
}
companyRows, err := db.Model(&model.Company{}).Where(companyIDs).Rows()
if err != nil {
if companyRows == nil {
return nil, []error{err}
}
}
defer companyRows.Close()
for companyRows.Next() {
var company model.Company
db.ScanRows(companyRows, &company)
if company.ID == 0 {
// no value returned
} else {
companyByCompanyID[int64(company.ID)] = &company
}
}
companyByUserID := map[int64]*model.Company{}
for userID, companyID := range companyIDbyUserID {
companyByUserID[userID] = companyByCompanyID[companyID]
}
orderedCompanies := make([]*model.Company, len(userIDs))
for i, id := range userIDs {
orderedCompanies[i] = companyByUserID[id]
}
return orderedCompanies, nil
},
})
}
func newCompanyByCodeLoader(db *gorm.DB) *generated.CompanyStringLoader {
return generated.NewCompanyStringLoader(generated.CompanyStringLoaderConfig{
MaxBatch: 1000,
Wait: 1 * time.Millisecond,
Fetch: func(companyCodes []string) ([]*model.Company, []error) {
rows, err := db.Model(&model.Company{}).Where("code IN (?)", companyCodes).Rows()
if err != nil {
if rows == nil {
return nil, []error{err}
}
// log error
}
defer rows.Close()
companyByCode := map[string]*model.Company{}
for rows.Next() {
var company model.Company
db.ScanRows(rows, &company)
if company.ID == 0 {
// no value returned
} else {
companyByCode[company.Code] = &company
}
}
orderedCompanies := make([]*model.Company, len(companyCodes))
for i, code := range companyCodes {
orderedCompanies[i] = companyByCode[code]
}
return orderedCompanies, nil
},
})
}