@directus/api/dist/utils/get-relation-info.js

Directus is a real-time API and App dashboard for managing SQL database content

import { getRelation } from '@directus/utils';
import { getRelationType } from './get-relation-type.js';
function checkImplicitRelation(field) {
    if (field.startsWith('$FOLLOW(') && field.endsWith(')')) {
        return field.slice(8, -1).split(',');
    }
    return null;
}
export function getRelationInfo(relations, collection, field) {
    if (field.startsWith('$FOLLOW') && field.length > 500) {
        throw new Error(`Implicit $FOLLOW statement is too big to parse. Got: "${field.substring(500)}..."`);
    }
    const implicitRelation = checkImplicitRelation(field);
    if (implicitRelation) {
        if (implicitRelation[2] === undefined) {
            const [m2oCollection, m2oField] = implicitRelation;
            const relation = {
                collection: m2oCollection.trim(),
                field: m2oField.trim(),
                related_collection: collection,
                schema: null,
                meta: null,
            };
            return { relation, relationType: 'o2m' };
        }
        else {
            const [a2oCollection, a2oItemField, a2oCollectionField] = implicitRelation;
            const relation = {
                collection: a2oCollection.trim(),
                field: a2oItemField.trim(),
                related_collection: collection,
                schema: null,
                meta: {
                    one_collection_field: a2oCollectionField.trim(),
                },
            };
            return { relation, relationType: 'o2a' };
        }
    }
    const relation = getRelation(relations, collection, field) ?? null;
    const relationType = relation ? getRelationType({ relation, collection, field }) : null;
    return { relation, relationType };
}