writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	newPolicies := make(map[string]policy.Policy)
	for name, p := range policies {
		_, err = json.Marshal(p)
		if err != nil {
			adminLogIf(ctx, err)
			continue
		}
		newPolicies[name] = p
	}
	if err = json.NewEncoder(w).Encode(newPolicies); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return

		return
	}

	newPolicies := newPolicySet.ToSlice()
	newPolicyMapping.Policies = strings.Join(newPolicies, ",")
	newPolicyMapping.UpdatedAt = UTCNow()
	addedOrRemoved = policiesToUpdate.ToSlice()

	// In case of detach operation, it is possible that no policies are mapped -
	// in this case, we delete the mapping from the store.
	if len(newPolicies) == 0 {