EddTally
Updating a Nested Map in a Schema
Hi,
I am currently having problems trying to update a nested map in a Schema since it doesn’t allow for Access behaviour I can’t just Kernel.put_in etc…
My Schema is as follows:
> %PhoenixApi.Schema.Test{
> __meta__: #Ecto.Schema.Metadata<:loaded, "test_table">,
> id: 1,
> delete: false,
> person: %{
> "city" => %{"55" => "London"},
> "name" => "john cena"
> "address" => "55 Test Drive"
> }
> }
I use get_test(id) to retrieve this information, but I would like to change the persons name and city before updating it/sending it back into my table.
This person is stored as a :map in the schema.
I know update needs a changeset to work, it’s how to make the changes in the changeset for Ecto.update and updating nested maps in structs is confusing me, sorry.
Thank you for reading.
Marked As Solved
EddTally
I have created a workaround? method?
I pattern match out of the get_test(id).
old_person = get_test(id)
%{id: id, delete: delete, person: person} = old_person
new_person = %{id: id, delete: delete, person: person}
Then I can use:
new_person = Kernel.put_in(new_person, [:person, "name"], "New Name")
because it is purely just a map now and not a Schema, then update row via the auto generated context function update_person:
> def update_person(%Test{} = test, attrs) do
> test
> |> Test.changeset(attrs)
> |> Repo.update()
> end
by
update_person(old_person, new_person)
and BAM it’s updated.
If anyone has any improvements I would love to hear them!
Also Liked
vfsoraki
You may also look into embeds_one to have your map treated as an embedded schema, with defined fields/changeset.
As for what you’ve achieved, that what I would do for a bare map too.
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