'
```
---
### Author:  [@solnic](https://discourse.rom-rb.org/u/solnic)
#### Post date: [October 22, 2017, 8:29am UTC](https://discourse.rom-rb.org/t/how-do-you-set-timestamps-in-version-4-0/186/4 "2017-10-22T08:29:24Z")
Do you have `rom` gem as a dependency and `require` it? It should require `rom-changeset` which adds `Relation#changeset` method.
---
### Author:  [@gus.black](https://discourse.rom-rb.org/u/gus.black)
#### Post date: [October 22, 2017, 11:10am UTC](https://discourse.rom-rb.org/t/how-do-you-set-timestamps-in-version-4-0/186/5 "2017-10-22T11:10:33Z")
@solnic That was the issue!! I only had rom-repository and rom-sql in my Gemfile!
Thank you.
---
### Author:  [@gus.black](https://discourse.rom-rb.org/u/gus.black)
#### Post date: [October 22, 2017, 4:14pm UTC](https://discourse.rom-rb.org/t/how-do-you-set-timestamps-in-version-4-0/186/6 "2017-10-22T16:14:44Z")
For anyone coming across this here is a working example on how we got timestamps working:
We have a timestamps module which we include in our repos and it looks like this:
```
module Persistence::Timestamps
┆ def create(attrs)
┆ ┆ super root.changeset(:create, attrs).map(:add_timestamps)
end
┆ def update(attrs)
┆ ┆ super root.changeset(:update, attrs).map(:add_timestamps)
┆ end
end
```
---
### Author:  [@buszu](https://discourse.rom-rb.org/u/buszu)
#### Post date: [February 28, 2018, 7:36pm UTC](https://discourse.rom-rb.org/t/how-do-you-set-timestamps-in-version-4-0/186/7 "2018-02-28T19:36:28Z")
I have also problem with setting timestamps. My repo looks like:
```ruby
require_relative './repository_base'
class DocumentationRepository < ROM::Repository[:documentations]
include RepositoryBase
# ...
end
```
And repository base is:
```ruby
module RepositoryBase
def self.included(base)
base.class_eval do
struct_namespace Entities
commands :create, update: :by_pk, delete: :by_pk
end
end
def create(attrs)
super root.changeset(:create, attrs).map(:add_timestamps)
end
def update(attrs)
super root.changeset(:update, attrs).map(:add_timestamps)
end
end
```
However create and update methods don’t seem to be reloaded. Still getting `ROM::SQL::NotNullConstraintError` for timestamps.
Edit - quoting @flash\_gordon:
@buszu that’s because the commands macro overrides your create/update methods in the target class. If you’re using changesets just do
`def create(attrs); root.changeset(:create, attrs).map(:add_timestamps).commit`
and don’t use commands for update it’s similar,
`def update(id:, **attrs); root.by_pk(id).changeset(:update, attrs).extend(:touch).commit`
---
### Author:  [@smaximov](https://discourse.rom-rb.org/u/smaximov)
#### Post date: [April 2, 2018, 12:24pm UTC](https://discourse.rom-rb.org/t/how-do-you-set-timestamps-in-version-4-0/186/8 "2018-04-02T12:24:09Z")
> [@buszu](#):
>
> However create and update methods don’t seem to be reloaded
Don’t you need to prepend `RepositoryBase` instead of including it so `create`/`update` would actually override base methods?