I am configuring a JSON schema and looking to include an optional property of Enum type. In the event that the user does not provide a value for this field, I need to set a default value.
// schema
"properties" : {
"Param" : {
"type" : "string",
"enum" : [ " p1", "p2" ],
"optional" : true,
"default" : "p2",
"required" : true
}
}
If the user omits the "Param" field, it will be automatically set to "p2"
Include the value null in the enum array
For more information, visit:
"properties" : {
"Param" : {
"type" : "string",
"enum" : [ " p1", "p2", null ], // <--
"default" : "p2", // <--
"required" : true
}
}
Just like in your example, the use of the "default" keyword in a JSON schema is valid, but its actual implementation depends on the consumer of the schema.
It's important to remember that JSON schema is primarily focused on defining and validating data structures. The inclusion of the "default" keyword came after extensive discussions because it's a common practice to provide a hint to clients regarding what a default value should be if they choose not to specify one. However, ultimately it's up to the client to decide whether or not to utilize this default value.
Another approach you could take in your specific scenario is to use "oneOf" to split enum values:
"required" : ["Param"],
"oneOf" : [{
"properties" : {
"Param" : {
"enum" : ["p2"]
}
}
}, {
"properties" : {
"Param" : {
"enum" : ["p1", "p3"]
}
}
}
]
This way, you are essentially telling the client, "You must send me at least 'Param' with the value 'p2'."
Additionally, you could consider implementing a pre-process step on your server side where any missing properties with default values are automatically added to the JSON message before validation takes place.
The key to solving this issue lies not in the structure itself, but rather in the processing and compilation of the data; any unspecified fields should default to a value of 0 when assigned to a variable.
For example:
"enum" : [ "optionA", "optionB" ],
which would translate to the following in C:
enum {
optionA = 0,
optionB = 1
}
I hope this clarifies things for you.
"attributes" : {
"Category" : {
"type" : "string",
"enum" : ["cat1", "cat2"],
"default" : "cat1"
}
},
"mandatory" : ["Category"]
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