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modelMapper.js
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modelMapper.js
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import assign from 'lodash/assign';
/**
* Converts one type of object to another, in this case to/from our Models to
* plain API response objects.
* @param {object} sourceObj The source object, either a Model or a plain API response object
* @param {array} mapping An array of arrays, the inner arrays containing key mappings between objects.
* Inner array format can be either ['modelPropertyKey', ['apiPropertyKey'] or
* ['modelPropertyKey', apiToModelTransformer(), modelToApiTransformer()]
* @param {bool} isMappingModelToApi True if we are taking a Model object an
* mapping to an API response object, otherwise false.
*/
function mappingReducer(sourceObj, mapping, isMappingModelToApi) {
const sourceMapIndex = isMappingModelToApi ? 0 : 1;
const targetMapIndex = isMappingModelToApi ? 1 : 0;
const lambdaMapIndex = isMappingModelToApi ? 2 : 1;
// Iterate through each element of the `mapping` object,
// and map the source property to the target property.
return mapping.reduce((targetObj, mapEl) => {
if (mapEl.length === 3) {
// We are using mapping functions to generate the result.
// Process and Object.assign the result.
if (mapEl[lambdaMapIndex] !== null) {
const result = mapEl[lambdaMapIndex](sourceObj);
assign(targetObj, result);
}
} else {
// Just a simple straight mapping conversion.
targetObj[mapEl[targetMapIndex]] = sourceObj[mapEl[sourceMapIndex]];
}
return targetObj;
}, {});
}
/**
* Converts a Model to an API response object
* @param {object} model The model to convert to a POJO
* @param {array} modelMap An array of arrays, the inner arrays containing key mappings between objects.
* Inner array format can be either ['modelPropertyKey', ['apiPropertyKey'] or
* ['modelPropertyKey', apiToModelTransformer(), modelToApiTransformer()]
*/
export function mapModelToApi(model, modelMap) {
return mappingReducer(model, modelMap, true);
}
/**
* Converts a plain API response object to a Model.
* @param {object} apiObject The API response to convert to a Model
* @param {array} modelMap An array of arrays, the inner arrays containing key mappings between objects.
* Inner array format can be either ['modelPropertyKey', ['apiPropertyKey'] or
* ['modelPropertyKey', apiToModelTransformer(), modelToApiTransformer()]
* @param {Prototype} modelPrototype The type of model we are creating (e.g., User)
*/
export function mapApiToModel(apiObject, modelMap, modelPrototype) {
const data = mappingReducer(apiObject, modelMap, false);
return new modelPrototype(data);
}