JSON SCHEMA - How can i check a values exists in an array - jsonschema

Question

I have a simple question. I have a property groupBy which is an array and contain only two possible values "product" and "date". Now i want to make another property required based upon a value exists in the groupBy array. In this case when my groupBy array contains "date" i want to make resolution required! How can i do that ?
Who can i check if an array contains a value ?
var data = {
"pcsStreamId": 123123,
"start": moment().valueOf(),
"end": moment().valueOf(),
"groupBy" : ["product"]
};
var schema = {
"type": "object",
"properties": {
"pcsStreamId": { "type": "number" },
"start": { "type": "integer", "minimum" : 0 },
"end": { "type": "integer", "minimum" : 0 },
"groupBy": {
"type": "array",
"uniqueItems": true,
"items" : {
"type": "string",
"enum": ["product", "date"]
},
"oneOf": [
{
"contains": { "enum": ["date"] },
"required": ["resolution"]
}
]
},
"resolution" : {
"type": "string",
"enum": ["day", "year", "month", "shift"]
},
},
"required": ["pcsStreamId", "start", "end", "groupBy"]
};

Answer 1

To solve the problem we have to use a boolean logic concept called implication. To put the requirement in boolean logic terms, we would say "groupBy" contains "date" implies that "resolution" is required. Implication can be expressed as "(not A) or B". In other words, either "groupBy" does not contain "date", or "resolution" is required. In this form, it should be more clear how to implement the solution.
{
"type": "object",
"properties": {
"pcsStreamId": { "type": "number" },
"start": { "type": "integer", "minimum": 0 },
"end": { "type": "integer", "minimum": 0 },
"groupBy": {
"type": "array",
"uniqueItems": true,
"items": { "enum": ["product", "date"] }
},
"resolution": { "enum": ["day", "year", "month", "shift"] }
},
"required": ["pcsStreamId", "start", "end", "groupBy"],
"anyOf": [
{ "not": { "$ref": "#/definitions/contains-date" } },
{ "required": ["resolution"] }
],
"definitions": {
"contains-date": {
"properties": {
"groupBy": {
"contains": { "enum": ["date"] }
}
}
}
}
}
Edit
This answer uses the new draft-06 contains keyword. I used it because the questioner used it, but if you are on draft-04, you can use this definition of "contains-date" instead. It uses another logic identity (∃x A <=> ¬∀x ¬A) to get the functionality of the contains keyword.
{
"definitions": {
"contains-date": {
"properties": {
"groupBy": {
"not": {
"items": {
"not": { "enum": ["date"] }
}
}
}
}
}
}
}

Answer 2

Your groupby property seems to be an object. May be its the nested enum property that you are talking about ( since that is an array and contains date and product). However, once you parsed this json to an object you can check something like:
groupby.items.enums.indexOf('date') === -1
array.indexOf(anyItem) returns the index of the item, if present in the array else it returns -1.
Hope that helps