klo
I have a schema that uses embeds_many and would like it to also allow for the list to be empty if there is no Actors. e.g.
id: "The Matrix",
actors: []
my schema:
field(:id, :string, primary_key: true)
embeds_many(:actors, Actor, on_replace: :delete)
field(:updated_timestamp, :map)
field(:updated_at, :utc_datetime)
end
my changeset:
def changeset(movie, %{} = params, opts \\ []) do
now = Keyword.get(opts, :now, DateTime.utc_now())
movie
|> cast(params, [
:id
])
|> cast_embed(:actors, with: &Actor.changeset/2, required: true)
|> Schema.put_updated_bson_timestamp(now)
|> Schema.put_updated_at(now)
|> validate_required(@required_fields)
end
When supplying required: true to cast_embed and the movie does not have any actors, we get a {:error, "actors can not be blank"}. When taking off the required: true the actors field can be missing completely and it is still valid. Is this an edge case where I would have to write my own validation for the :actors field?
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joey_the_snake
What kind of issue are you running into by keeping it optional?
embeds_manyfields have a default of empty list so if they’re not provided they will be set to[]. Is there some kind of edge case you’re running into that isn’t working as expected?klo
i would like to enforce that the field should be there even if it is empty. If
required: trueis set and the actors list is[]it will say the changeset is invalid because the actors list is empty..joey_the_snake
The field will have a default value of
[]because it’s anembeds_many. So if you make it optional it won’t raise and it will be set to[]automatically if not there. This should suffice? Or am I mistaken?klo
When i wrote a test for it and deleted the
:actorskey from theMovieschema the changeset is still valid but my intentions is for the changeset to not be valid when the:actorskey is missing. It should still be valid when actors is a empty list though.Keeping it optional will allow for the key to not be there at which is not what i am after. However using the
require: truei am not able to leave the list as empty as it detects it is emptyjoey_the_snake
Oh ok I think I see now. You want to protect against someone manually overwriting it to
nil? You won’t be able to do it withcast_embedso you’ll have to make your own function. You can useget_fieldto see if it isnilin the changes or the original data.klo
ahh ok ok ill give it a shot and report back.
klo
Ended up writing my own function to check if the field is included inside of the params and validating it that way.