# `EctoCommons.Helpers`
[🔗](https://github.com/achedeuzot/ecto_commons/blob/v0.3.7/lib/validators/helpers.ex#L1)

Contains helpers related to Ecto.

See functions contained in the module for more info.

# `validate_many`

This allows for validating multiple fields with the same validator function
with the same options for all fields.

## Example

    iex> types = %{first_name: :string, last_name: :string}
    iex> params = %{first_name: "John", last_name: "Doe"}
    iex> Ecto.Changeset.cast({%{}, types}, params, Map.keys(types))
    ...> |> validate_many(
    ...>   [:first_name, :last_name],
    ...>   &Ecto.Changeset.validate_length/3,
    ...>   min: 2,
    ...>   max: 20
    ...> )
    #Ecto.Changeset<action: nil, changes: %{first_name: "John", last_name: "Doe"}, errors: [], data: %{}, valid?: true, ...>

    iex> types = %{first_name: :string, last_name: :string}
    iex> params = %{first_name: "J", last_name: "DoppelgängerDoppelgänger"}
    iex> Ecto.Changeset.cast({%{}, types}, params, Map.keys(types))
    ...> |> validate_many(
    ...>   [:first_name, :last_name],
    ...>   &Ecto.Changeset.validate_length/3,
    ...>   min: 2,
    ...>   max: 20,
    ...>   message: "this field is invalid"
    ...> )
    #Ecto.Changeset<action: nil, changes: %{first_name: "J", last_name: "DoppelgängerDoppelgänger"}, errors: [last_name: {"this field is invalid", [count: 20, validation: :length, kind: :max, type: :string]}, first_name: {"this field is invalid", [count: 2, validation: :length, kind: :min, type: :string]}], data: %{}, valid?: false, ...>

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