Json Schema Validation Decimal Number

Question

The following Python script must validate the number of decimal places in the records. In the schema I am trying to define that it has 3 decimal places, using "multipleOf": 0.001.
I have a record with 5 decimal places: "scores": [1.12345]
It should report an error but it is returning:

Validation ok
     scores
0 1.12345

How can I fix this?

import jsonschema
import pandas as pd

schema = {
    "type": "array",
    "properties": {"scores": {"type": "number", "multipleOf": 0.001}},
}


df = pd.DataFrame(
    {
        "scores": [1.12345],
    }
)

validator = jsonschema.Draft202012Validator(schema)

try:
    validator.validate(instance=df.to_dict("records"))
    print("Validation ok")

except jsonschema.ValidationError as e:
    print(f"Validation error: {e.message}")

print(df)

Asked By: Antonio José

||

Source

Answer 1

Your validation is not successful because the type:array is defined incorrectly. Your scores array instance is never validated because the schema only knows about "scores": 1.000 OR [] at the root.

EDIT:
I didn’t see you are using dataframes which are an array instance

Try this schema

schema = {
    "type": "array",
    "items": {
      "type": "object",
      "properties": { "scores": {
         "type": "array", "items": {"type": "number", "multipleOf": 0.001 }}}}},
}

This would be equivalent to

[{"scores": [1.000, 1.235, 2.333]}]

Answered By: Jeremy Fiel

Answer 2

It worked with Jeremy’s suggestion

import jsonschema
import pandas as pd

schema = {
    "type": "array",
    "items": {
        "type": "object",
        "properties": {"scores": {"type": "array", "items": {"type": "number", "multipleOf": 0.001}}},
    },
}

df = pd.DataFrame(
    [
        {
            "scores": [1.1234],
        }
    ]
)

validator = jsonschema.Draft202012Validator(schema)

try:
    validator.validate(instance=df.to_dict("records"))
    print("Validation ok")

except jsonschema.ValidationError as e:
    print(f"Validation error: {e.message}")

print(df)

Thank you Jeremy!

Answered By: Antonio José

Json Schema Validation Decimal Number

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