How do I do a nested list (array) of schema refere

Question

I am trying to build a schema which has a list of items that I want to have an enforced schema.

Basically here is the data I want to validate against the schema:

data = {
    "VIN" : "123",
    "timestamp" : "xxxx",
    "model" : "jeep",
    "inspections": [
        { "door_badge" : 
             {
                "expected": "yes",
                "image": "/image/path/here",
                "state": 1
            },
        },
        {
            "rear_badge" :
            {
                "expected" : "yes",
                "image" : "/image/path/here",
                "state": 1
            }


        }
    ],
}

And my schema mapping as is such but seem to be getting errors when trying to validate:

schema = {
    "$schema": "http://json-schema.org/draft-04/schema#",
    "definitions": {
        "inspection": {
            "type": "object",
            "properties": {
                "expected" : { "type": "string" },
                "found": { "type" : "string"},
                "state" : { "enum" : [0,1] },
                "image" : { "type" : "string"}
            },
            "required": ["state", "image"]
        },
        "inspections" : {
            "type" : "array",
            "items" : {
                "$ref" : "#/definitions/inspection"
            },
            "required" : ["items"]
        },

    },
    "type" : "object",
    "properties" : {
        "VIN" : { "type" : "string" },
        "timestamp" : { "type" : "string"},
        "model" : { "type" : "string"},
        "inspections" : { "$ref" : "#/definitions/inspections"}
    },
    "required": ["VIN", "timestamp", "model"]
}

I basically want sub list within the inspection list but also to validate based on that type of item.

---

SOLUTION: Thanks to jruizaranguren's help the solution was:

schema = {
    "$schema": "http://json-schema.org/draft-04/schema#",
    "definitions": {
        "inspection": {
            "type": "object",
            "properties": {
                "expected" : { "type": "string" },
                "found": { "type" : "string"},
                "state" : { "enum" : [0,1] },
                "image" : { "type" : "string"}
            },
            "required": ["state", "image", "expected"]
        },
    },
    "type" : "object",
    "properties" : {
        "VIN" : { "type" : "string" },
        "timestamp" : { "type" : "string"},
        "model" : { "type" : "string"},
        "inspections" : { 
            "type" : "array",
            "items" : {
                "type" : "object",
                "maxProperties": 1,
                "minProperties": 1,
                "additionalProperties" : {
                    "$ref" : "#/definitions/inspection"
                }
            }
        }
    },
    "required": ["VIN", "timestamp", "model", "inspections"]
}

Answer 1

The problem you have is that you are constraining each item in the array to be of the form:

{
    "expected": "yes",
    "image": "/image/path/here",
    "state": 1
}

But your objects are of the form:

{ "door_badge" : 
    {
        "expected": "yes",
        "image": "/image/path/here",
         "state": 1
    },
}

One way to achieve this would be to use additionalProperties in the items clause:

"items" : 
    { 
            "type" : "object",
            "maxProperties": 1,
            "minProperties": 1,
            "additionalProperties" : {
                "$ref" : "#/definitions/inspection"
            }
    }

If you can enforce some rules on these properties keys (for instance, all must end with badge) then you may use patternProperties clause with a regular expression.