import { PrimaryColumn, Column } from 'typeorm';
export class LocationStatus {
@PrimaryColumn({ name: 'location_id' })
locationId: string;
@Column({ name: 'area_code', type: 'int' })
areaCode: number;
}
I've been struggling for hours trying to extract the values of the properties location_id and area_code using the property decorator @Column(), but so far, no success. I'm unsure if it's even feasible to retrieve a list of properties in this way.
After examining the source code of typeorm (found here, here, here, here), it appears that you can access various information using the global variable typeormMetadataArgsStorage (such as
window.typeormMetadataArgsStorageglobal.typeormMetadataArgsStorageconst global_context = ??? // depending on your environment
const property_to_look_for = `areaCode`
const name = global_context.typeormMetadataArgsStorage
.columns
.filter(col => col.propertyName === property_to_look_for && col.target === LocationStatus)
.options
.name
console.log(name)
UPDATED
For those utilizing Nest framework like myself, here's my current approach.
import { getMetadataArgsStorage, InsertResult } from 'typeorm';
export class PinLocationStatusRepository extends Repository<PinLocationStatus> {
// List of column names in this array should not be altered.
// For example, the value of "location_id" as "location_ko_01" remains unchanged.
private static immutableColumnNames = ['location_id', ...];
private static mutableColumnFound(name: string): boolean {
return PinLocationStatusRepository.immutableColumnNames.every(colName => colName !== name);
}
savePinLocation(state: PinLocationStatus): Promise<InsertResult> {
const columns = getMetadataArgsStorage()
.columns.filter(({ target }) => target === PinLocationStatus)
.map(({ options, propertyName }) => (!options.name ? propertyName : options.name))
.reduce((columns, name) => {
if (PinLocationStatusRepository.mutableColumnFound(name)) {
columns.push(name);
}
return columns;
}, []);
return this.createQueryBuilder()
.insert()
.into(PinLocationStatus)
.values(state)
.orUpdate({ overwrite: columns }) // ['area_code']
.execute();
}
}
@Column() decorator.overwrite property.The output will be accurate unless "area_code" is a fixed column.
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