Valdi another datavalidation

Your Libraries & OS Mentoring Libraries
1

I know that Vex is a great and popular data validation library. But learn how to write a library is fun and I can learn lots of things. So I build my own library called Valdi

  • It supports validate value against multiple validation:
iex(12)> Valdi.validate(10, type: :integer, number: [min: 10, max: 20])
:ok
iex(13)> Valdi.validate("email@g.c", type: :string, format: ~r/.+@.+\.[a-z]{2,10}/)
{:error, "format not matched"}
  • You can validate list of value
iex(51)> Valdi.validate_list([1,2,3], type: :integer, number: [min: 2])
{:error, [[0, "must be greater than or equal to 2"]]}
  • And validate map data too
iex(54)>  validation_spec = %{
...(54)>     email: [type: :string],
...(54)>     password: [type: :string, length: [min: 8]],
...(54)>     age: [type: :integer, number: [min: 16, max: 60]]
...(54)>   }
iex(56)> Valdi.validate_map(%{name: "dzung", password: "123456", emal: "ddd@example.com", age: 28}, validation_spec)
{:error, %{password: "length must be greater than or equal to 8"}}

Thank for reading.
Please comment if you have any suggestion.

1 Like
2

My comments would be pretty much the same as here :wink:

2 Likes
3

Thank you for your comment. I used Ecto.Changeset before and there are some reason why I build another one:

  • Some simple project or library, using Ecto is overkill
  • I need a simple and clean way. Changeset neet much code to do the same thing
    Using Ecto.Changeset
types = %{a: :integer}
data = %{a: "hello"}
default = %{}
changeset = 
    {default, types} 
    |> Ecto.Changeset.cast(data, Map.keys(types)) 
    |> Ecto.Changeset.validate_required([:a]) 
    |> Ecto.Changeset.validate_number(greater_than: 5)

Using Valdi

data_spec = %{a: [type: :integer, required: true, number: [greater_than: 5]}
Valdi.validate(%{a: "hello"}, data_spec)

I have tried wrapping Ecto before but I have to do some hack to support nested and dynamic default value

3 Likes
4

Love this answer!

Coming from python world, where things like cerberus exist, validating request params with Ecto felt like hunting a fly with AR.

Thanks for this minimalistic library!

1 Like
5

Thank you. Love to hear that. :smiling_face_with_three_hearts: