redux-grim/src/normalization/getNormalizerMiddleware.js

Generator for asynchronous Redux endpoint actions and reducers

import normalize from './normalize';
import processRules from './processRules';
import { isSuccessType, isSetType } from '../util';

/**
 * Create Redux middleware function which normalizes entities
 */
export default function getNormalizerMiddleware(arrayRules, callback) {
  const rules = processRules(arrayRules);
  return () => next => action => {
    // Only normalize success actions
    if (isSuccessType(action.type) || isSetType(action.type)) {
      // entityType is added by autogenerated actions. Normalization only applies
      // to autogenerated components.
      const { payload, meta } = action;
      const entityType = meta && meta.entityType;
      if (entityType && payload && rules[entityType]) {
        meta.entities = {};
        action.payload = normalize(rules, entityType, payload, meta.entities);
        callback && callback(entityType, payload);
      }
    }
    return next(action);
  };
}