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validators.go
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validators.go
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package schema
import (
"errors"
"fmt"
)
type TableValidator interface {
Validate(t *Table) error
}
type LengthTableValidator struct{}
const (
maxTableName = 63 // maximum allowed identifier length is 63 bytes https://www.postgresql.org/docs/13/limits.html
maxColumnName = 63
)
var defaultValidators = []TableValidator{
LengthTableValidator{},
}
func ValidateTable(t *Table) error {
for _, validator := range defaultValidators {
return validator.Validate(t)
}
return nil
}
func validateTableAttributesNameLength(t *Table) error {
// validate table name
if len(t.Name) > maxTableName {
return errors.New("table name has exceeded max length")
}
// validate table columns
for _, col := range t.Columns.Names() {
if len(col) > maxColumnName {
return fmt.Errorf("column name %s has exceeded max length", col)
}
}
// validate table relations
for _, rel := range t.Relations {
err := validateTableAttributesNameLength(rel)
if err != nil {
return err
}
}
return nil
}
func (LengthTableValidator) Validate(t *Table) error {
return validateTableAttributesNameLength(t)
}