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// @flow
// used to update feed caches with new threads in real time
// takes an array of existing threads in the cache and figures out how to insert the newly updated thread
export const parseRealtimeThreads = (
prevThreads: Array<any>,
updatedThread: Object
) => {
// get an array of thread ids based on the threads already in cache
const prevThreadIds = prevThreads.map(thread => thread.node.id);
// determine if the newly updated thread exists in the cache or not
// if it doesn't exist in cache, it's a new thread! if it does exist in cache, it just means its
// been updated with a new message
const hasNewThread = prevThreadIds.indexOf(updatedThread.id) < 0;
return hasNewThread
? [
{
node: updatedThread,
cursor: '__this-is-a-cursor__',
__typename: 'Thread',
},
...prevThreads,
]
: [
...prevThreads.map(thread => {
if (thread.node.id !== updatedThread.id) return thread;
return {
node: updatedThread,
cursor: '__this-is-a-cursor__',
__typename: 'Thread',
};
}),
];
};
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