I'm trying to validate a classic JSON schema (with Ajv and json-server) with required fields, but for a HTTP PATCH request.
It's okay for a POST because the data arrive in full and nothing should be ommited.
However, the required fields of the schema make problem when attempting to PATCH an existing resource.
Here's what I'm currently doing for a POST :
const schema = require('./movieSchema.json');
const validate = new Ajv().compile(schema);
// ...
movieValidation.post('/:id', function (req, res, next) {
const valid = validate(req.body);
if (!valid) {
const [err] = validate.errors;
let field = (err.keyword === 'required') ? err.params.missingProperty : err.dataPath;
return res.status(400).json({
errorMessage: `Erreur de type '${err.keyword}' sur le champs '${field}' : '${err.message}'`
});
}
next();
});
... but if i'm doing the same for a movieValidation.patch(...)
and tries to send only this chunk of data :
{
"release_date": "2020-07-15",
"categories": [
"Action",
"Aventure",
"Science-Fiction",
"Thriller"
]
}
... it will fail the whole validation (whereas all the fields are okay and they validate the schema)
Here's my complete moviesSchema.json
:
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"title": {
"title": "Titre",
"type": "string",
"description": "Titre complet du film"
},
"release_date": {
"title": "Date de sortie",
"description": "Date de sortie du film au cinéma",
"type": "string",
"format": "date",
"example": "2019-06-28"
},
"categories": {
"title": "Catégories",
"description": "Catégories du film",
"type": "array",
"items": {
"type": "string"
}
},
"description": {
"title": "Résumé",
"description": "Résumé du film",
"type": "string"
},
"poster": {
"title": "Affiche",
"description": "Affiche officielle du film",
"type": "string",
"pattern": "^https?:\/\/"
},
"backdrop": {
"title": "Fond",
"description": "Image de fond",
"type": "string",
"pattern": "^https?:\/\/"
}
},
"required": [
"title",
"release_date",
"categories",
"description"
],
"additionalProperties": false
}
For now, I did the trick using a different schema which is the same as the original one, but without the required
clause at the end. But I don't like this solution as it's duplicating code unnecessarily (and it's not elegant at all).
Is there any clever solution/tool to achieve this properly? Thanks