/
update.go
43 lines (35 loc) · 944 Bytes
/
update.go
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package migrate
import (
"fmt"
"github.com/abibby/bob/builder"
"github.com/abibby/bob/models"
"github.com/abibby/bob/schema"
"github.com/abibby/bob/selects"
)
var (
ErrNoChanges = fmt.Errorf("no changes")
)
func (m *Migrations) update(model models.Model) (*schema.UpdateTableBuilder, *schema.UpdateTableBuilder, error) {
err := selects.InitializeRelationships(model)
if err != nil {
return nil, nil, err
}
tableName := builder.GetTable(model)
fields, err := getFields(model)
if err != nil {
return nil, nil, err
}
oldTable := m.Blueprint(tableName)
newTable := blueprintFromFields(tableName, fields)
hasChanges := false
up := schema.Table(tableName, func(table *schema.Blueprint) {
hasChanges = table.Update(oldTable, newTable)
})
down := schema.Table(tableName, func(table *schema.Blueprint) {
table.Update(newTable, oldTable)
})
if !hasChanges {
return nil, nil, ErrNoChanges
}
return up, down, nil
}