Refactoring redux state into different reducers

app/assets/javascripts/components/reducers/relationships.jsx

@@ -0,0 +1,34 @@
+import {
+  ACCOUNT_FOLLOW_SUCCESS,
+  ACCOUNT_UNFOLLOW_SUCCESS,
+  ACCOUNT_BLOCK_SUCCESS,
+  ACCOUNT_UNBLOCK_SUCCESS,
+  RELATIONSHIPS_FETCH_SUCCESS
+} from '../actions/accounts';
+import Immutable from 'immutable';
+
+const normalizeRelationship = (state, relationship) => state.set(relationship.get('id'), relationship);
+
+const normalizeRelationships = (state, relationships) => {
+  relationships.forEach(relationship => {
+    state = normalizeRelationship(state, relationship);
+  });
+
+  return state;
+};
+
+const initialState = Immutable.Map();
+
+export default function relationships(state = initialState, action) {
+  switch(action.type) {
+    case ACCOUNT_FOLLOW_SUCCESS:
+    case ACCOUNT_UNFOLLOW_SUCCESS:
+    case ACCOUNT_BLOCK_SUCCESS:
+    case ACCOUNT_UNBLOCK_SUCCESS:
+      return normalizeRelationship(state, Immutable.fromJS(action.relationship));
+    case RELATIONSHIPS_FETCH_SUCCESS:
+      return normalizeRelationships(state, Immutable.fromJS(action.relationships));
+    default:
+      return state;
+  }
+};