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Allow Prolific participants to re-join experiments. #1009

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Allow Prolific participants to re-join experiments. #1009

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16 changes: 16 additions & 0 deletions functions/src/participant.endpoints.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,22 @@ export const createParticipant = onCall(async (request) => {
handleCreateParticipantValidationErrors(data);
}

// If prolificId is provided, check for an existing non-deleted participant
if (data.prolificId) {
const existing = await app
.firestore()
.collection(`experiments/${data.experimentId}/participants`)
.where('prolificId', '==', data.prolificId)
.get();

const existingParticipant = existing.docs
.map((doc) => doc.data() as ParticipantProfileExtended)
.find((p) => p.currentStatus !== ParticipantStatus.DELETED);
if (existingParticipant) {
return {id: existingParticipant.privateId};
}
}

// Create initial participant config
const participantConfig = createParticipantProfileExtended({
currentCohortId: data.cohortId,
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