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Template for building deeply nested FQL queries for FaunaDB
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const baseQuery = q.Paginate(q.Match(q.Index(indexName), terms)); | |
// or | |
// const baseQuery = q.Paginate(q.Collection(collectionName)) | |
const expandedQuery = q.Map(baseQuery, (ref) => | |
q.Let( | |
{ | |
instance: q.Get(q.Var('ref')) | |
}, | |
{ | |
// easy stuff | |
_id: q.Select(['id'], q.Var('ref')), | |
_ts: q.Select(['ts'], q.Var('instance')), | |
scalarField: q.Select(['data', 'scalarField'], q.Var('instance'), null), | |
scalarArray: q.Select(['data', 'scalarArray'], q.Var('instance'), []), | |
// embedded fields | |
embeddedField: q.Select( | |
['data', 'embeddedField'], | |
q.Var('instance'), | |
null | |
), | |
/* or */ | |
selectedEmbeddedField: q.Let( | |
{ | |
embeddedField: q.Select( | |
['data', 'embeddedField'], | |
q.Var('instance'), | |
null | |
) | |
}, | |
q.If(q.Equals([q.Var('embeddedField'), null]), null, { | |
a: q.Select(['a'], q.Var('embeddedField'), null), | |
b: q.Select(['b'], q.Var('embeddedField'), null) | |
}) | |
), | |
// one-to-one w/ reference in this collection | |
referenceField: q.Let( | |
{ | |
ref: q.Select(['data', 'referenceField'], q.Var('instance'), null), | |
instance: q.Get(q.Var('ref')) | |
}, | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
), | |
// multiple references in this collection | |
referenceArray: q.Map( | |
q.Select(['data', 'referenceArray'], q.Var('instance'), []), | |
(ref) => | |
q.Let( | |
{ | |
instance: q.Get(q.Var('ref')) | |
}, | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
), | |
// one-to-one with reference in other collection | |
indexByRef: q.Let( | |
{ | |
page: Paginate(Match(Index('thing2ByThing1'), q.Var('instance'))), | |
ref: q.Select(['data', 0], q.Var('page')), | |
instance: q.Get(q.Var('ref')) | |
}, | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
), | |
// one-to-many with reference in other collection | |
indexByRef: q.Map( | |
q.Paginate(Match(Index('thing2sByThing1'), q.Var('instance'))), | |
(ref) => | |
q.Let( | |
{ | |
instance: q.Get(q.Var('ref')) | |
}, | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
), | |
// many-to-many with link table | |
indexByRef: q.Map( | |
q.Paginate(Match(Index('thing2sByThing1s'), q.Var('instance'))), | |
(linkRef) => | |
q.Let( | |
{ | |
link: q.Get(q.Var('linkRef')), | |
ref: q.Select(['data', 'thing2'], q.Var('link')), | |
instance: q.Get(q.Var('ref')) | |
}, | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
) | |
} | |
) | |
); |
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const baseQuery = q.Paginate(q.Match(q.Index(indexName), terms)); | |
// or | |
// const baseQuery = q.Paginate(q.Collection(collectionName)) | |
const expandedQuery = q.Map(baseQuery, (ref) => | |
q.Let( | |
{ | |
instance: q.Get(q.Var('ref')) | |
}, | |
q.Merge( | |
q.Var('instance'), | |
{ | |
// easy stuff | |
_id: q.Select(['id'], q.Var('ref')), | |
_ts: q.Select(['ts'], q.Var('instance')), | |
// one-to-one w/ reference in this collection | |
referenceField: q.Let( | |
{ | |
ref: q.Select(['data', 'referenceField'], q.Var('instance'), null), | |
instance: q.Get(q.Var('ref')) | |
}, | |
q.Merge( | |
q.Var('instance'), | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
), | |
// multiple references in this collection | |
referenceArray: q.Map( | |
q.Select(['data', 'referenceArray'], q.Var('instance'), []), | |
(ref) => | |
q.Let( | |
{ | |
instance: q.Get(q.Var('ref')) | |
}, | |
q.Merge( | |
q.Var('instance'), | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
) | |
), | |
// one-to-one with reference in other collection | |
indexByRef: q.Let( | |
{ | |
page: Paginate(Match(Index('thing2ByThing1'), q.Var('instance'))), | |
ref: q.Select(['data', 0], q.Var('page')), | |
instance: q.Get(q.Var('ref')) | |
}, | |
q.Merge( | |
q.Var('instance'), | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
), | |
// one-to-many with reference in other collection | |
indexByRef: q.Map( | |
q.Paginate(Match(Index('thing2sByThing1'), q.Var('instance'))), | |
(ref) => | |
q.Let( | |
{ | |
instance: q.Get(q.Var('ref')) | |
}, | |
q.Merge( | |
q.Var('instance'), | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
) | |
), | |
// many-to-many with link table | |
indexByRef: q.Map( | |
q.Paginate(Match(Index('thing2sByThing1s'), q.Var('instance'))), | |
(linkRef) => | |
q.Let( | |
{ | |
link: q.Get(q.Var('linkRef')), | |
ref: q.Select(['data', 'thing2'], q.Var('link')), | |
instance: q.Get(q.Var('ref')) | |
}, | |
q.Merge( | |
q.Var('instance'), | |
{ | |
/* repeat above recursively */ | |
/* `ref` and `instance` variables are scoped! */ | |
} | |
) | |
) | |
) | |
} | |
) | |
) | |
); |
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