Function search

lib/helpers/populate/getSchemaTypes.js:49–219

(parts, schema, subdoc, nestedPath)

  }

  function search(parts, schema, subdoc, nestedPath) {
    let p = parts.length + 1;
    let foundschema;
    let trypath;

    while (p--) {
      trypath = parts.slice(0, p).join('.');
      foundschema = schema.path(trypath);
      if (foundschema == null) {
        continue;
      }

      if (foundschema.embeddedSchemaType || foundschema.schema) {
        // array of Mixed?
        if (foundschema.embeddedSchemaType instanceof Mixed) {
          return foundschema.embeddedSchemaType;
        }

        let schemas = null;
        if (foundschema.schema?.discriminators != null) {
          const discriminators = foundschema.schema.discriminators;
          const discriminatorKeyPath = trypath + '.' +
            foundschema.schema.options.discriminatorKey;
          const keys = subdoc ? mpath.get(discriminatorKeyPath, subdoc) || [] : [];
          schemas = Object.keys(discriminators).
            reduce(function(cur, discriminator) {
              const tiedValue = discriminators[discriminator].discriminatorMapping.value;
              if (doc == null || keys.indexOf(discriminator) !== -1 || keys.indexOf(tiedValue) !== -1) {
                cur.push(discriminators[discriminator]);
              }
              return cur;
            }, []);
        }

        // Now that we found the array, we need to check if there
        // are remaining document paths to look up for casting.
        // Also we need to handle array.$.path since schema.path
        // doesn't work for that.
        // If there is no foundschema.schema we are dealing with
        // a path like array.$
        if (p !== parts.length && foundschema.schema) {
          let ret;
          if (parts[p] === '$') {
            if (p + 1 === parts.length) {
              // comments.$
              return foundschema;
            }
            // comments.$.comments.$.title
            ret = search(
              parts.slice(p + 1),
              schema,
              subdoc ? mpath.get(trypath, subdoc) : null,
              nestedPath.concat(parts.slice(0, p))
            );
            if (ret) {
              ret.$parentSchemaDocArray = ret.$parentSchemaDocArray ||
                (foundschema.schema.$isSingleNested ? null : foundschema);
            }