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Many_to_many ecto

/phoenix#ecto#config-testing#ecto-insert
NewBee

NewBee

I was trying to update my attributes tags which a list (many_to_many) but the update deletes the old data and put the new one ! how Can I do so I keep the old ones and add other data?
thank you

3 comments
/phoenix#ecto#config-testing#ecto-insert
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benwilson512

benwilson512

Author of Craft GraphQL APIs in Elixir with Absinthe

If you’re using many_to_many you need to preload all of the existing records so that it can diff the ones you’re providing against the ones that are known to exist. Then it will add any new ones, remove any old ones, etc.

0
Post #1
tfwright

tfwright

Example:

    schema = schema
    |> Repo.preload(:other_schemas)

    schema
    |> Schema.changeset(%{})
    |> Ecto.Changeset.put_assoc(:other_schemas, [schema | schema.other_schemas]))
    |> Repo.update
1
Post #2
NewBee

NewBee OP

Can you give me an exemple please?
Thank you

0
Post #3
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