arrayFilters in mongodb

问题

I have the following schema.

{
   posts: [
          {
             _id: '5ayuunbdsyuuuyut778'
             replies: [{
                 _id: "67hfudj7e9whduu888",
                 text: "something"
             }]
          }
      ]
}

I want to update the text in particular reply. I am using mongoose.

I have written the query as follows

Post.findOneAndUpdate(
   {'posts.replies._id': _id}, 
   {$set: {'posts.$[post].replies.$[reply].text': "something1"}},
   { arrayFilters: [{'post._id': postId}, { 'reply._id': _id }]}
 )

This query is not updating the document.

Am I missing something? Do I need to cast ids using ObjectId

回答1:

You need to use new: true to get the updated value and cast id to mongoose objectId to make it work

Post.findOneAndUpdate(
   { 'posts.replies._id': _id }, 
   { $set: { 'posts.$[post].replies.$[reply].text': "something1" } },
   { arrayFilters: [{ 'post._id': postId }, { 'reply._id': _id }], new: true }
)

回答2:

As arrayFilters are something related to mongodb, you need to cast id in mongoose with ObjectId

Post.findOneAndUpdate(
   { 'posts.replies._id': _id }, 
   { $set: { 'posts.$[post].replies.$[reply].text': "something1" } },
   { arrayFilters: [{ 'post._id': postId }, { 'reply._id': _id }]}
)

must be changed to

Post.findOneAndUpdate(
   { 'posts.replies._id': _id }, 
   { $set: { 'posts.$[post].replies.$[reply].text': "something1" } },
   { arrayFilters: [{ 'post._id': ObjectId(postId) }, { 'reply._id': ObjectId(_id)}]}
)

来源：https://stackoverflow.com/questions/51324876/arrayfilters-in-mongodb

标签

mongodb

mongoose

mongodb-query