chemist
Will love some advice
Basically i have a map comprising of another nested map.
I am using Ecto.Changeset to cast the values and validate them
input:
{ document: {"id": 2091}, players: ["1", "2"], details: {"code": "100", "id: "saas"}}
data = %{}
types = %{document: :map, players: {:array, :string}, details: :assoc}
details_types = %{code: :string, id: :string}
changeset =
{data, types}
|> Changeset.cast(input, Map.keys(types))
|> Changeset.cast_assoc(:details, Map.keys(details_types))
But doing this generates an error:
%UndefinedFunctionError{arity: 1, function: :cast, message: nil, module: :assoc, reason: nil}, stack: [{:assoc, :cast, [%{"code" => "100", "id" => "saas"}]
Many thanks
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trisolaran
The basic problem here is that you’re defining
detailsto be of type:assocbut:associs not a type, unless you defined it somewhere else. Ecto is telling you that it was trying to castdetailsbut it could not find any method calledcastin theassocmodule. Here’s the list of Ecto types available by default.If
:detailsis an arbitrary map, then you should use type:mapfor it. If it has to follow a predefined structure, then I would define a schema for it and turn it into an association. In general, if you’re dealing with complex or nested data structures, it’s easier to work with schemas rather than using inline{data, types}tuples.chemist
Hi thanks very much. Apologies but if i assign a type :map to details, i get an error that an :assoc is expected which is why i defined the type as an :assoc.
kokolegorille
You should show the document schema, and how You set up the association with details…
You should also have a look at embedded schema, and cast embed, as it might be helpful.
trisolaran
yes because you’re using
cast_assoc, which you can only use if you define an association, but you haven’t defined any. You define an association by declaring a schema and callinghas_one,has_many,embeds_one,embeds_manyetc.You should rewrite your code using a schema definition (it doesn’t appear like you’re using any, as you’re working with inline types), and/or explain a bit better what you’re trying to achieve.
I also recommend reading the ecto schema docs.