Clever Geek Handbook

Changes to Ecto models

I have a model with a string field that must be at least two characters long:

def changeset(model, params \\ :empty) do
  model
  |> cast(params, @required_fields, @optional_fields)
  |> validate_length(:name, min: 2)
end

The problem is that changeet.errors, when legitimately populated, returns:

[name: {"should be at least %{count} characters", 2}]

Is this a bug, if not how can I interpolate this tuple?

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1 answer


If you use it with Phoenix, it will automatically take care of you in form_for/4

or when creating a JSON structure. Otherwise, you need to go through it yourself and call it String.replace(string, "%{count}", Integer.to_string(count))

.



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