# Function: convertColumnsToLegacy()

convertColumnsToLegacy(columns): Record<string, string&gt;

Defined in: packages/core/src/transformers/EnhancedJsonMapping.ts:146

Converts enhanced column configurations to simple string mappings for legacy compatibility.

This function transforms complex column configurations (with type info, nullable flags, etc.) into simple string mappings that can be used with PostgresJsonQueryBuilder.

Supported Input Formats:

• Simple strings: "user_name" → "user_name"
• Column config: { column: "u.name", type: "string" } → "u.name"
• From config: { from: "user_name", nullable: true } → "user_name"

Parameters

columns

Record<string, any&gt;

Record of field names to column configurations

Returns

Record<string, string&gt;

Record of field names to column source strings

Example

const enhanced = {
  id: { column: "u.user_id", type: "number" },
  name: { from: "user_name", type: "string" },
  email: "email_address"
};

const legacy = convertColumnsToLegacy(enhanced);
// Result: { id: "u.user_id", name: "user_name", email: "email_address" }