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parseCompositeKey.ts
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parseCompositeKey.ts
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/**
* DynamoDB Toolbox: A simple set of tools for working with Amazon DynamoDB
* @author Jeremy Daly <jeremy@jeremydaly.com>
* @license MIT
*/
import { A, O } from 'ts-toolbelt'
import { error } from './utils.js'
import parseMapping from './parseMapping.js'
import {
CompositeAttributeDefinition,
PureAttributeDefinition,
AttributeDefinitions
} from '../classes/Entity/types.js'
import { TrackingInfo } from './parseEntity.js'
const parseCompositeKey = <
ReadonlyAttributeDefinitions extends
| AttributeDefinitions
| O.Readonly<AttributeDefinitions, A.Key, 'deep'>
>(
field: string,
config: CompositeAttributeDefinition,
track: TrackingInfo,
schema: ReadonlyAttributeDefinitions
) => {
if (config.length >= 2 && config.length <= 3) {
const link = schema[config[0]] ? config[0] : error(`'${field}' must reference another field`)
const pos =
parseInt(config[1].toString()) === config[1]
? config[1]
: error(`'${field}' position value must be numeric`)
// 🔨 TOIMPROVE: Prevent casting if possible
const sub_config = (!config[2]
? { type: 'string' }
: ['string', 'number', 'boolean'].includes(config[2].toString())
? { type: config[2] }
: config[2]?.constructor === Object
? config[2]
: error(
`'${field}' type must be 'string', 'number', 'boolean' or a configuration object`
)) as PureAttributeDefinition
// Add linked fields
if (!track.linked[link]) track.linked[link] = []
track.linked[link][pos] = field
// Merge/validate extra config data and add link and pos
return Object.assign(
{
[field]: Object.assign(
{ save: true }, // default save to true
parseMapping(field, sub_config, track)[field],
{ link, pos }
)
},
sub_config.alias
? {
[sub_config.alias]: Object.assign({}, sub_config, { map: field })
}
: {}
)
} else {
error(`Composite key configurations must have 2 or 3 items`)
}
}
export default parseCompositeKey