The issue arises when using Array.prototype.filter() on arrays containing objects due to inconsistencies in the quotes used

Currently, I am using Express along with Mongoose for my project. I have encountered an issue with filtering an array obtained from a database. The objects retrieved from the database are structured differently compared to the object format in my request. This discrepancy seems to be causing issues with the filtering process. How can this be resolved?

router.post("/deleteTask", auth, async (req, res) => {
  try {
    const user = await User.findById(req.user);
    console.log(req.body.task);
    console.log(user.tasks.filter(task => task !== req.body.task));
    await User.updateOne(
      { _id: req.user },
      { tasks: user.tasks.filter(task => task !== req.body.task) },
      { upsert: true }
    );
    res.json(true);
  } catch (error) {
    res.json({
      message: error.message
    });
  }
});

The first console.log displays

{ title: 'test888', description: '' }

while the second console.log shows

... {"title":"test888","description":""} ...

Answer №1

When comparing two objects, the outcome is usually false unless they are actually the same.

For a more in-depth explanation, check out this resource: How to determine equality for two JavaScript objects?

In your scenario, one way to quickly resolve the issue is by comparing titles within your filter function:

task => task.title !== req.body.task.title

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