How to check user input is a valid column before appending condition?

Does anyone knows the proper way to do so?

 if (columnFilters.length > 0) {
  const columnWhereClause: (SQL | undefined)[] = columnFilters.map(
    (filter) => {
      const columns = getTableColumns(tasks);

      if (filter.column in columns) {
        // getting error on columns[filter.column]: type 'string' can't be used to index type 
        return ilike(columns[filter.column], `%${filter.keyword}%`);
      }
    },
  );
  whereClause.push(and(...columnWhereClause));
}

 if (columnFilters.length > 0) {
  const columnWhereClause: (SQL | undefined)[] = columnFilters.map(
    (filter) => {
      const columns = getTableColumns(tasks);

      if (filter.column in columns) {
        // getting error on columns[filter.column]: type 'string' can't be used to index type 
        return ilike(columns[filter.column], `%${filter.keyword}%`);
      }
    },
  );
  whereClause.push(and(...columnWhereClause));
}

3 Replies

Sillvva•3mo ago

Can you show the how you defined the columnFilters variable?

Sillvva•3mo ago

Basically, rather than string, the filter.column property should be of type keyof typeof tasks["_"]["columns"]. For example:

ArChak•3mo ago

suer, here is the definition, seems I have to make this generic to fit other table as well, thank you

export class SearchColumnFilter {
  @ApiProperty()
  @IsString()
  @IsNotEmpty()
  column: string;

  @ApiProperty()
  @IsString()
  @IsNotEmpty()
  keyword: string;
}

export class SearchColumnFilter {
  @ApiProperty()
  @IsString()
  @IsNotEmpty()
  column: string;

  @ApiProperty()
  @IsString()
  @IsNotEmpty()
  keyword: string;
}

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How to check user input is a valid column before appending condition?