alias.js

import { invariant, isPropSchema, isAliasedPropSchema, isIdentifierPropSchema } from "../utils/utils"
import { _defaultPrimitiveProp } from "../constants"

/**
 * Alias indicates that this model property should be named differently in the generated json.
 * Alias should be the outermost propschema.
 *
 * @example
 * createModelSchema(Todo, {
 *     title: alias('task', primitive()),
 * });
 *
 * console.dir(serialize(new Todo('test')));
 * // { task : "test" }
 *
 * @param {string} name name of the json field to be used for this property
 * @param {PropSchema} propSchema propSchema to (de)serialize the contents of this field
 * @returns {PropSchema}
 */
export default function alias(name, propSchema) {
    invariant(name && typeof name === "string", "expected prop name as first argument")
    propSchema = (!propSchema || propSchema === true)  ? _defaultPrimitiveProp : propSchema
    invariant(isPropSchema(propSchema), "expected prop schema as second argument")
    invariant(!isAliasedPropSchema(propSchema), "provided prop is already aliased")
    return {
        jsonname: name,
        serializer: propSchema.serializer,
        deserializer: propSchema.deserializer,
        identifier: isIdentifierPropSchema(propSchema),
        beforeDeserialize: propSchema.beforeDeserialize,
        afterDeserialize: propSchema.afterDeserialize
    }
}