Wigny
Saving many entries from a form at once
Hey folks,
I have a problem that does not seem to have a straightforward solution to me, but it feels like it should have one:
How should we go about saving a form (adding/removing/updating entries) that produces a list of changesets, makes the operations in the DB and then refreshes the form with the new values?
I know that is possible when the form is based on a schema that has an embeds_many or has_many, as we have a guide in LiveView docs and also the excellent One-to-Many LiveView Form | Benjamin Milde article from @lostkobrakai, but given I would like to change multiples entries that doesn’t belongs_to a unique schema, how can I put this together inside a single form?
This question comes from a page that I’m trying to build that should allow the user to add a new entry in the DB, update an existing one or delete it, like in a bulk operation. Also, the table should have constraints, and therefore I thought using changesets would make it easy to handle and return error messages for inputs.
I’ve put a gist that goes into the direction of what I want, but I’m stuck in saving the list of changesets and refreshing the form based on this list:
How would you tackle that? Would you simply not use form to solve this problem?
First Post!
LostKobrakai
Why do you think you cannot create one? It could even live just in the controller/live view rendering your form.
Last Post!
Wigny
Yes, I have. I think the form wasn’t behaving correctly when I tried it because I was calling put_embed after the changesets being applied to the DB, which caused them to have the action replace and it left the form in a wrong state.
I guess I found a workaround for that, which is to reinitialise the original changeset instead of trying to update it after applying the operations to the DB. The code is something like this now:
def save(changeset) do
emails_changesets = get_embed(changeset, :emails)
case apply_changesets(emails_changesets) do
{:ok, emails_list} -> {:ok, MailingList.changeset(%MailingList{emails: emails_list})}
{:error, emails_changesets} -> {:error, put_embed(changeset, :emails, emails_changesets)}
end
end
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