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Fix expand hasMany relationship #1542

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Fix expand hasMany relationship #1542

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15 changes: 10 additions & 5 deletions src/server/router/plural.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,11 +33,16 @@ module.exports = (db, name, opts) => {
[].concat(e).forEach((innerResource) => {
const plural = pluralize(innerResource)
if (db.get(plural).value()) {
const prop = `${innerResource}${opts.foreignKeySuffix}`
resource[innerResource] = db
.get(plural)
.getById(resource[prop])
.value()
// Search for `<resourceName>` before `<resourceName>Id` key in the resource
// if `<resourceName>` not found, then look for `<resourceName>Id`
// we need this for hasMany relationship, e.g. `posts/3?_expand=tags`
// here will search first for `tags` key inside `resource` before looking for `tagsId`
const prop = Object.keys(resource).includes(innerResource) ? innerResource : `${innerResource}${opts.foreignKeySuffix}`;

// Now just check if its value is an array, e.g. `"tags": [1, 2]` or just `"userId": 3`
resource[innerResource] = (Array.isArray(resource[prop]))
? resource[prop].reduce((acc, id) => [...acc, db.get(plural).getById(id).value()], [])
: resource[innerResource] = db.get(plural).getById(resource[prop]).value();
}
})
}
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