freeCodeCamp/server/services/challenge.js

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import debug from 'debug';
import { pickBy } from 'lodash';
import { Observable } from 'rx';
import { cachedMap, getMapForLang } from '../utils/map';
import { shapeChallenges } from '../../common/app/redux/utils';
const log = debug('fcc:services:challenge');
const isDev = debug.enabled('fcc:*');
export default function getChallengesForBlock(app) {
const challengeMap = cachedMap(app.models);
return {
name: 'challenges-for-block',
read: function readChallengesForBlock(
req,
resource,
{ blockName, lang = 'en' } = {},
config,
cb
) {
log(`sourcing challenges for the ${blockName} block`);
return challengeMap.map(getMapForLang(lang))
.flatMap(({
result: { superBlocks },
entities: {
block: fullBlockMap,
challenge: challengeMap
}
}) => {
const requestedChallenges = pickBy(
challengeMap,
ch => ch.block === blockName
);
const entities = {
block: {
[blockName]: fullBlockMap[blockName]
},
challenge: requestedChallenges
};
const { challenge, block } = shapeChallenges(entities, isDev);
return Observable.of({
result: { superBlocks },
entities: { challenge, block }
});
})
.subscribe(
result => cb(null, result),
cb
);
}
};
}