Move selectors around

common/app/routes/challenges/components/Challenge.jsx

@@ -1,13 +1,26 @@
 import React, { PropTypes } from 'react';
-
-import PureComponent from 'react-pure-render/component';
+import { connect } from 'react-redux';
 import { Col } from 'react-bootstrap';
+import { createSelector } from 'reselect';
+import PureComponent from 'react-pure-render/component';
 
 import Editor from './Editor.jsx';
 import SidePanel from './Side-Panel.jsx';
 import Preview from './Preview.jsx';
+import { challengeSelector } from '../redux/selectors';
 
-export default class extends PureComponent {
+const mapStateToProps = createSelector(
+  challengeSelector,
+  state => state.challengesApp.content,
+  ({ challenge, showPreview, mode }, content) => ({
+    content,
+    challenge,
+    showPreview,
+    mode
+  })
+);
+
+export class Challenge extends PureComponent {
   static displayName = 'Challenge';
 
   static propTypes = {
@@ -54,3 +67,5 @@ export default class extends PureComponent {
     );
   }
 }
+
+export default connect(mapStateToProps)(Challenge);

common/app/routes/challenges/components/Challenges.jsx

@@ -8,35 +8,16 @@ import PureComponent from 'react-pure-render/component';
 import Challenge from './Challenge.jsx';
 import Step from './step/Step.jsx';
 import { fetchChallenge } from '../../../redux/actions';
-import { STEP, HTML } from '../../../utils/challengeTypes';
+import { challengeSelector } from '../redux/selectors';
 
 const bindableActions = {
   fetchChallenge
 };
 
-const challengeSelector = createSelector(
-  state => state.challengesApp.challenge,
-  state => state.entities.challenge,
-  (challengeName, challengeMap) => {
-    const challenge = challengeMap[challengeName];
-    return {
-      challenge: challenge,
-      showPreview: !!challenge && challenge.challengeType === HTML,
-      isStep: !!challenge && challenge.challengeType === STEP,
-      mode: !!challenge && challenge.challengeType === HTML ?
-        'text/html' :
-        'javascript'
-    };
-  }
-);
-
 const mapStateToProps = createSelector(
   challengeSelector,
-  state => state.challengesApp.content,
-  (challengeProps, content) => ({
-    ...challengeProps,
-    content
-  })
+  state => state.challengesApp.challenge,
+  ({ isStep }, challenge) => ({ challenge, isStep })
 );
 
 const fetchOptions = {
@@ -45,24 +26,19 @@ const fetchOptions = {
     return [ dashedName ];
   },
   isPrimed({ challenge }) {
-    return challenge;
+    return !!challenge;
   }
 };
 
 export class Challenges extends PureComponent {
   static displayName = 'Challenges';
-  static propTypes = {
-    challenge: PropTypes.object,
-    showPreview: PropTypes.bool,
-    mode: PropTypes.string,
-    isStep: PropTypes.bool
-  };
+  static propTypes = { isStep: PropTypes.bool };
 
   render() {
     if (this.props.isStep) {
-      return <Step { ...this.props }/>;
+      return <Step />;
     }
-    return <Challenge { ...this.props }/>;
+    return <Challenge />;
   }
 }
 

common/app/routes/challenges/components/step/Step.jsx

@@ -2,17 +2,20 @@ import React, { PropTypes } from 'react';
 import classnames from 'classnames';
 import { connect } from 'react-redux';
 import { createSelector } from 'reselect';
-import { goToStep } from '../../redux/actions';
 import PureComponent from 'react-pure-render/component';
 import ReactTransitionReplace from 'react-css-transition-replace';
 
+import { goToStep } from '../../redux/actions';
+import { challengeSelector } from '../../redux/selectors';
 import { Button, Col, Image, Row } from 'react-bootstrap';
 
 const transitionTimeout = 1000;
 const mapStateToProps = createSelector(
+  challengeSelector,
   state => state.challengesApp.currentStep,
   state => state.challengesApp.previousStep,
-  (currentStep, previousStep) => ({
+  ({ challenge }, currentStep, previousStep) => ({
+    challenge,
     currentStep,
     previousStep,
     isGoingForward: currentStep > previousStep

common/app/routes/challenges/redux/selectors.js

@@ -0,0 +1,21 @@
+import { STEP, HTML } from '../../../utils/challengeTypes';
+import { createSelector } from 'reselect';
+
+export const challengeSelector = createSelector(
+  state => state.challengesApp.challenge,
+  state => state.entities.challenge,
+  (challengeName, challengeMap) => {
+    if (!challengeName || !challengeMap) {
+      return {};
+    }
+    const challenge = challengeMap[challengeName];
+    return {
+      challenge: challenge,
+      showPreview: !!challenge && challenge.challengeType === HTML,
+      isStep: !!challenge && challenge.challengeType === STEP,
+      mode: !!challenge && challenge.challengeType === HTML ?
+        'text/html' :
+        'javascript'
+    };
+  }
+);