script
I know in elixir data types are immutable. I have a column name failed_login_tries. which is integer and i want to increment it every time user put incorrect password. this is the code
defp check_chromatic_password(plaintext, %User{} = user) do
if Bcrypt.checkpw(plaintext, user.local_password_hash) do
{:ok, user}
else
{:error, :invalid_password}
end
end
failed_login_tries is inside the %User struct
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snofang
You can use Optimistic Lock feature; This keeps you away from races invalid results and also let you have
timestampsfunctionality in place.silverdr
What do you think of the approach shown here:
Right - locking is costly but in this particular case it might be even seen as an advantage?
LostKobrakai
Timestamps use the autogenerate functionality of ecto schema fields, which is runtime functionality. So those are not set on the db.
silverdr
Does it use the “elixir time” or the “database time” for this? If it uses “database time” then I’d need the same to pass to the
set: [updated_at: <here>]. I am not yet the whole codebase savvy enough to quickly find and verify it in the source tree..LostKobrakai
It is though. Updating timestamps is a “schema” feature, which is not supported by the lower level
*_allapi’s on the repo.silverdr
Is there a “correct” way to update the
timestamps()(:updated_at) when doing this? I mean I know I can addset: [updated_at: ....]to the query and pass the current time but that doesn’t seem “correct”.benwilson512
That’s correct.
tjdam
This way of expressing a query, does that mean I can only get this update passing it to an update_all()?
At first I was trying to pass it to a one() since I know I will get only one result, but it doesn’t seem to work.
aseigo
I always forget about
inc(and friends) .. thanks for the reminder!LostKobrakai
There’s an even simpler option to write that query: