@sap/cds-compiler/lib/checks/existsMustNotStartWithDollarSelf.js

CDS (Core Data Services) compiler and backends

'use strict';

/**
 * A path following an “exists” predicate must always end in an association.
 *
 * @param {object} parent
 * @param {string} prop
 * @param {Array} expression
 * @param {CSN.Path} path
 */
function existsMustNotStartWithDollarSelf( parent, prop, expression, path ) {
  for (let i = 0; i < expression?.length - 1; i++) {
    if (expression[i] === 'exists') {
      const next = expression[i + 1];
      if (next.$scope === '$self') {
        const errorPath = path.concat([ prop, i ]);
        this.error('ref-unexpected-self', errorPath, {
          '#': 'exists',
          id: next.ref[0],
          name: 'exists',
        });
      }
    }
  }
}

module.exports = {
  having: existsMustNotStartWithDollarSelf,
  where: existsMustNotStartWithDollarSelf,
  xpr: existsMustNotStartWithDollarSelf,
};