website/pkg/models/subscription.go

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package models
import (
"time"
"code.nonshy.com/nonshy/website/pkg/log"
)
// Subscription table - for notifications. You comment on someone's post, you get subscribed
// to other comments added to the post (unless you opt off).
type Subscription struct {
ID uint64 `gorm:"primaryKey"`
UserID uint64 `gorm:"index"` // who it belongs to
Subscribed bool `gorm:"index"`
TableName string // on which of your tables (photos, comments, ...)
TableID uint64
CreatedAt time.Time
UpdatedAt time.Time
}
// GetSubscription looks for an existing subscription or returns error if not found.
func GetSubscription(user *User, tableName string, tableID uint64) (*Subscription, error) {
var s *Subscription
result := DB.Model(s).Where(
"user_id = ? AND table_name = ? AND table_id = ?",
user.ID, tableName, tableID,
).First(&s)
return s, result.Error
}
// GetSubscribers returns all of the UserIDs that are subscribed to a thread.
func GetSubscribers(tableName string, tableID uint64) []uint64 {
var userIDs = []uint64{}
result := DB.Table(
"subscriptions",
).Select(
"user_id",
).Where(
"table_name = ? AND table_id = ? AND subscribed IS TRUE",
tableName, tableID,
).Scan(&userIDs)
if result.Error != nil {
log.Error("GetSubscribers(%s, %d): couldn't get user IDs: %s", tableName, tableID)
}
return userIDs
}
// IsSubscribed checks whether a user is currently subscribed (and notified) to a thing.
// Returns whether the row exists, and whether the user is to be notified (false if opted out).
func IsSubscribed(user *User, tableName string, tableID uint64) (exists bool, notified bool) {
if sub, err := GetSubscription(user, tableName, tableID); err != nil {
return false, false
} else {
return true, sub.Subscribed
}
}
// SubscribeTo creates a subscription to a thing (comment thread) to be notified of future activity on.
func SubscribeTo(user *User, tableName string, tableID uint64) (*Subscription, error) {
// Is there already a subscription row?
if sub, err := GetSubscription(user, tableName, tableID); err == nil {
return sub, err
}
// Create the default subscription.
sub := &Subscription{
UserID: user.ID,
Subscribed: true,
TableName: tableName,
TableID: tableID,
}
result := DB.Create(sub)
return sub, result.Error
}
// Save a subscription.
func (n *Subscription) Save() error {
return DB.Save(n).Error
}