Validates an object as :ok when it does not match the provided schema about ex_json_schema HOT 5 CLOSED

Found the problem. It errors out, which is the expected behavior, when you don't pipe. ExJsonSchema.Validator.validate(schema, foo) will produce the error messages, but foo |> ExJsonSchema.Validator.validate(schema) does not. This is probably because I misunderstand how Elixir handles partial function application.

bug_report.exs

defmodule Bug_Report do
  def main do

  schema = %{
      "type" => "object",
      "properties" => %{
        "foo" => %{
          "type" => "number"
        },
        "bar" => %{
          "type" => ["number", "null"]
        },
        "baz" => %{
          "type" => "string"
        },
      },
      "additionalProperties" => false
    } |> ExJsonSchema.Schema.resolve

    foo = %{
      "foo" => "Hello",
      "bar" => false,
      "baz" => 123
    }

    case ExJsonSchema.Validator.validate(schema, foo) do
      :ok -> foo |> inspect |> IO.puts
      # Even giving the validator an object with no fields that exist in the schema results in :ok.
      {:error, messages} -> messages |> inspect |> IO.puts
    end
  end
end

Bug_Report.main

from ex_json_schema.

By default, JSON Schema ignores properties that are not specified. You can change that behaviour by adding "additionalProperties" => false to your schema, then your example would fail. A more in-depth explanation of how objects and properties work can be found here: https://spacetelescope.github.io/understanding-json-schema/reference/object.html#properties

from ex_json_schema.

Yeah, the |> operator is very specific, it passes the value on the left side as the first parameter to the function on the right side. In this case, it doesn't work unfortunately (actually I realized much later that the payload should be the first parameter to validate and the schema the second, but I didn't want to introduce that breaking change just to make things a bit more convenient).

from ex_json_schema.

Ah thanks. I'm coming from Elm, where we pipe to the last parameter.

from ex_json_schema.

👍

from ex_json_schema.