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fix: do not introspect mongodb reserved system collections #1110

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fix: do not introspect mongodb reserved system collections #1110

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11 changes: 8 additions & 3 deletions packages/datasource-mongo/src/introspection/structure.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,9 +11,14 @@ export default class Structure {
}: { collectionSampleSize: number; referenceSampleSize: number },
): Promise<ModelStudy[]> {
const collections = await connection.collections();
const promises = collections.map(collection =>
this.analyzeCollection(collection, collectionSampleSize, referenceSampleSize),
);

// https://www.mongodb.com/docs/manual/reference/system-collections/
// collection within admin.system are reserved for mongodb
const promises = collections
.filter(collection => !collection.namespace?.startsWith('admin.system.'))
.map(collection =>
this.analyzeCollection(collection, collectionSampleSize, referenceSampleSize),
);
const structure = await Promise.all(promises);

return structure
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26 changes: 25 additions & 1 deletion packages/datasource-mongo/test/introspection/structure.unit.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ describe('Introspection > Structure', () => {
function setupConnectionMock(
collectionDefinitions: Array<{
collectionName: string;
namespace?: string;
records: Array<Record<string, unknown>>;
}>,
) {
Expand All @@ -24,7 +25,7 @@ describe('Introspection > Structure', () => {
}> = [];
const mongoRecords: Array<Record<string, unknown>[]> = [];

const collections = collectionDefinitions.map(({ collectionName, records }) => {
const collections = collectionDefinitions.map(({ collectionName, namespace, records }) => {
const collectionMongoRecords = records;
const query = {
limit: jest.fn().mockReturnValue(asyncIterate(collectionMongoRecords)),
Expand All @@ -36,6 +37,7 @@ describe('Introspection > Structure', () => {

return {
collectionName,
namespace,
find,
};
});
Expand Down Expand Up @@ -64,6 +66,28 @@ describe('Introspection > Structure', () => {
expect(structure).toEqual([]);
});

it('should not return system collections', async () => {
const { connection } = setupConnectionMock([
{
collectionName: 'users',
namespace: 'admin.system.users',
records: [{ name: 'nicolas' }],
},
{
collectionName: 'books',
namespace: 'admin.documents',
records: [{ name: 'the lord of the rings' }],
},
]);

const structure = await Structure.introspect(connection as unknown as MongoDb, {
collectionSampleSize: 1,
referenceSampleSize: 1,
});

expect(structure).toEqual([expect.objectContaining({ name: 'books' })]);
});

it('should return collections sorted by name', async () => {
const { connection } = setupConnectionMock([
{
Expand Down
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