import type { ILoadOptionsFunctions, ResourceMapperFields, FieldType } from 'n8n-workflow'; import { getEnumValues, getEnums, getTableSchema, uniqueColumns } from '../helpers/utils'; import { configurePostgres } from '../transport'; const fieldTypeMapping: Partial> = { string: ['text', 'varchar', 'character varying', 'character', 'char'], number: [ 'integer', 'smallint', 'bigint', 'decimal', 'numeric', 'real', 'double precision', 'smallserial', 'serial', 'bigserial', ], boolean: ['boolean'], dateTime: [ 'timestamp', 'date', 'timestampz', 'timestamp without time zone', 'timestamp with time zone', ], time: ['time', 'time without time zone', 'time with time zone'], object: ['json', 'jsonb'], options: ['enum', 'USER-DEFINED'], array: ['ARRAY'], }; function mapPostgresType(postgresType: string): FieldType { let mappedType: FieldType = 'string'; for (const t of Object.keys(fieldTypeMapping)) { const postgresTypes = fieldTypeMapping[t as FieldType]; if (postgresTypes?.includes(postgresType)) { mappedType = t as FieldType; } } return mappedType; } export async function getMappingColumns( this: ILoadOptionsFunctions, ): Promise { const credentials = await this.getCredentials('postgres'); const { db } = await configurePostgres(credentials); const schema = this.getNodeParameter('schema', 0, { extractValue: true, }) as string; const table = this.getNodeParameter('table', 0, { extractValue: true, }) as string; const operation = this.getNodeParameter('operation', 0, { extractValue: true, }) as string; try { const columns = await getTableSchema(db, schema, table); const unique = operation === 'upsert' ? await uniqueColumns(db, table) : []; const enumInfo = await getEnums(db); const fields = await Promise.all( columns.map(async (col) => { const canBeUsedToMatch = operation === 'upsert' ? unique.some((u) => u.attname === col.column_name) : true; const type = mapPostgresType(col.data_type); const options = type === 'options' ? getEnumValues(enumInfo, col.udt_name) : undefined; const isAutoIncrement = col.column_default?.startsWith('nextval'); return { id: col.column_name, displayName: col.column_name, required: col.is_nullable !== 'YES' && !isAutoIncrement, defaultMatch: col.column_name === 'id', display: true, type, canBeUsedToMatch, options, }; }), ); return { fields }; } catch (error) { throw error; } }