# `Logistiki.Knowledge.TemplateResolver`
[🔗](https://github.com/thanos/logistiki/blob/v0.1.0/lib/logistiki/knowledge/template_resolver.ex#L1)

Resolves the posting template for a selected accounting policy.

A template is a list of posting specs (`%{sequence, direction, role,
amount_var, currency_var}`). The journal builder turns a template plus
resolved account roles into concrete postings.

# `resolve`
*since 0.1.0* 

```elixir
@spec resolve(Logistiki.Event.Normalized.t()) ::
  {:ok, Logistiki.Knowledge.Result.t(), [map()]}
  | {:error, :no_template_found | term()}
```

Resolves the template postings for `normalized_event`'s selected policy.

## Arguments

  * `normalized_event` — `%Logistiki.Event.Normalized{}`.

## Returns

  * `{:ok, %Result{}, [posting_spec]}` — the full knowledge result and the
    ordered posting specs for the selected policy.
  * `{:error, :no_template_found}` — the selected policy has no template.
  * `{:error, term()}` — knowledge evaluation failed.

## Examples

    iex> {:ok, result, postings} = Logistiki.Knowledge.TemplateResolver.resolve(normalized_deposit)
    iex> length(postings)
    2
    iex> hd(postings).role
    :cash_account

# `resolve_account_role`
*since 0.1.0* 

```elixir
@spec resolve_account_role(map(), atom()) ::
  {:ok, String.t()} | {:error, {:missing_account_role, atom()}}
```

Resolves the concrete account code for `role` from `account_roles`.

## Arguments

  * `account_roles` — `map()` — the role-to-code map from a `Result`
    (e.g. `%{cash_account: "ASSETS:CASH:USD:NOSTRO"}`).
  * `role` — `atom()` — the symbolic role (e.g. `:cash_account`).

## Returns

  * `{:ok, String.t()}` — the resolved account code.
  * `{:error, {:missing_account_role, role}}` — no mapping for this role.

## Examples

    iex> {:ok, "ASSETS:CASH:USD:NOSTRO"} = Logistiki.Knowledge.TemplateResolver.resolve_account_role(
    ...>   %{cash_account: "ASSETS:CASH:USD:NOSTRO"}, :cash_account
    ...> )
    iex> {:error, {:missing_account_role, :unknown_role}} = Logistiki.Knowledge.TemplateResolver.resolve_account_role(%{}, :unknown_role)

---

*Consult [api-reference.md](api-reference.md) for complete listing*