72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package db
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import (
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"context"
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"database/sql"
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"github.com/pkg/errors"
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"github.com/uptrace/bun"
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)
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type listgetter[T any] struct {
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q *bun.SelectQuery
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items *[]*T
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pageOpts *PageOpts
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defaults *PageOpts
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}
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type List[T any] struct {
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Items []*T
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Total int
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PageOpts PageOpts
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}
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type Filter struct {
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Field string
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Value any
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}
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func GetList[T any](tx bun.Tx, pageOpts, defaults *PageOpts) *listgetter[T] {
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l := &listgetter[T]{
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items: new([]*T),
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pageOpts: pageOpts,
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defaults: defaults,
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}
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l.q = tx.NewSelect().
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Model(l.items)
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return l
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}
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func (l *listgetter[T]) Relation(name string, apply ...func(*bun.SelectQuery) *bun.SelectQuery) *listgetter[T] {
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l.q = l.q.Relation(name, apply...)
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return l
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}
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func (l *listgetter[T]) Filter(filters ...Filter) *listgetter[T] {
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for _, filter := range filters {
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l.q = l.q.Where("? = ?", bun.Ident(filter.Field), filter.Value)
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}
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return l
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}
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func (l *listgetter[T]) GetAll(ctx context.Context) (*List[T], error) {
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if l.defaults == nil {
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return nil, errors.New("default pageopts is nil")
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}
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total, err := l.q.Count(ctx)
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if err != nil {
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return nil, errors.Wrap(err, "query.Count")
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}
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l.q, l.pageOpts = setPageOpts(l.q, l.pageOpts, l.defaults, total)
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err = l.q.Scan(ctx)
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if err != nil && errors.Is(err, sql.ErrNoRows) {
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return nil, errors.Wrap(err, "query.Scan")
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}
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list := &List[T]{
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Items: *l.items,
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Total: total,
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PageOpts: *l.pageOpts,
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}
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return list, nil
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}
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