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favourites.go
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favourites.go
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package bete
import (
"github.com/pkg/errors"
)
type FavouriteRepository interface {
// Find searches for a favourite given a user ID and the name of the favourite,
// returning the saved query if it exists and an empty string otherwise.
Find(userID int64, name string) string
Put(userID int64, name, query string) error
List(userID int64) ([]string, error)
Delete(userID int64, name string) error
}
type SQLFavouriteRepository struct {
DB Conn
}
func (r SQLFavouriteRepository) Find(userID int64, text string) string {
var query string
err := r.DB.QueryRow("select query from favourites where user_id = $1 and name = $2", userID, text).Scan(&query)
if err != nil {
return ""
}
return query
}
func (r SQLFavouriteRepository) Put(userID int64, name, query string) error {
_, err := r.DB.Exec(`insert into favourites (user_id, name, query)
values ($1, $2, $3)
on conflict (user_id, name) do update set query = excluded.query`, userID, name, query)
if err != nil {
return errors.Wrap(err, "error putting new favourite")
}
return nil
}
func (r SQLFavouriteRepository) List(userID int64) ([]string, error) {
rows, err := r.DB.Query("select name from favourites where user_id = $1", userID)
if err != nil {
return nil, errors.Wrap(err, "error querying favourites")
}
defer rows.Close()
var favourites []string
for rows.Next() {
var f string
if err := rows.Scan(&f); err != nil {
return favourites, errors.Wrap(err, "error scanning row")
}
favourites = append(favourites, f)
}
if err := rows.Err(); err != nil {
return favourites, errors.Wrap(err, "error iterating rows")
}
return favourites, nil
}
func (r SQLFavouriteRepository) Delete(userID int64, name string) error {
_, err := r.DB.Exec("delete from favourites where user_id = $1 and name = $2", userID, name)
return errors.Wrap(err, "error deleting favourite")
}