Allow blank example

[nonotest]

Hello I can't get the allow_blank validator to work.
Would it be possible to add an example in the doc?

For example:

params do
   requires :foo, type: :string, allow_blank: :true
end

but sending an empty string still fails the requires validation

thanks!

[falood]

I'll explain it later, for now keep_blank is useful for you 🙂

params do
   requires :foo, type: :string, keep_blank: true
end

[nonotest]

Hello!

thanks for the reply.

It looks like keep_blank will always put a blank value, no matter what.
What I am after is requiring the field but allowing a blank value. is that possible?

Thanks again!

[falood]

Sorry, didn't get what do you want, can you show me your use case?

here are some examples:

• for this line requires :foo, type: :string, foo="123" get %{foo: "123"} and foo="" get Parsing Param Error.

• for this line requires :foo, type: :string, keep_blank: true, foo="123" get %{foo: "123"} and foo="" get %{foo: ""}

• for this line optional :foo, type: :string, foo="123" get %{foo: "123"} and foo="" get %{}

By default, it's equal to pass blank parameters([], '', "", nil, %{}) and don't pass this parameter, {"a": 1, "b": null} and {"a": 1} are the same. keep_blank is useful to keep blank parameter for this case.