Read actions

I have this read action:

read :groups_by_organization_id do
  argument :organization_id, :uuid, allow_nil?: false

  filter expr(organization_id == ^arg(:organization_id))
  pagination offset?: true, countable: true, default_limit: 1000
end

read :groups_by_organization_id do
  argument :organization_id, :uuid, allow_nil?: false

  filter expr(organization_id == ^arg(:organization_id))
  pagination offset?: true, countable: true, default_limit: 1000
end

Inside the filter expression, instead of the incoming organization_id, I want to use a different value that I derive from it:

decendant_orgs = get_descendant_organizations!([organization_id])
ids = [arg(:organization_id)] ++ Enum.map(descendant_orgs, org -> org.id end)

filter expr(organization_id == ^ids)

decendant_orgs = get_descendant_organizations!([organization_id])
ids = [arg(:organization_id)] ++ Enum.map(descendant_orgs, org -> org.id end)

filter expr(organization_id == ^ids)

Is this possible?

6 Replies

ZachDaniel•2w ago

prepare fn query, _ -> 
  Ash.Query.before_action(query, fn query ->
    organization_id = query.arguments.organization_id
    descendants = get_descendant_organizations!([organization_id]) 
    ids = [organization_id | descendants]
    Ash.Query.filter(query, organization_id in ^ids)
  end)
end

prepare fn query, _ -> 
  Ash.Query.before_action(query, fn query ->
    organization_id = query.arguments.organization_id
    descendants = get_descendant_organizations!([organization_id]) 
    ids = [organization_id | descendants]
    Ash.Query.filter(query, organization_id in ^ids)
  end)
end

you can use a preparation w/ a before_action hook to run more queries that modify the main query

EgeOP•2w ago

I tried that but I got:

 The pin operator ^ is supported only inside matches or inside custom macros. Make sure you are inside a match or all necessary macros have been required
    │
 36 │           Ash.Query.filter(query, organization_id in ^ids)

 The pin operator ^ is supported only inside matches or inside custom macros. Make sure you are inside a match or all necessary macros have been required
    │
 36 │           Ash.Query.filter(query, organization_id in ^ids)

ZachDaniel•2w ago

add require Ash.Query to the top of your module

ZachDaniel•2w ago

https://github.com/elixir-lang/elixir/issues/13465

GitHub

Better error message for undefined variables within remote calls to...

Current behavior When calling macros like Ecto.Query, you often end up with an error message that can be cryptic, especially with beginners. For example, the following code without adding require E...

ZachDaniel•2w ago

I have an issue out for this kind of error being confusing

EgeOP•2w ago

Thanks, this appears to be working 🙂

Gaming

Programming

Read actions

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