node.js - How do I use a pre save hook database value in Mongoose? -


i want value of object before pre-save hook , compare new value. suggested in mongoose db value in pre-save hook , https://github.com/automattic/mongoose/issues/2952, did post-init hook copied doc._original. issue i'm not sure how access ._original in different hook.

fieldschema   .post('save', function (doc) {     console.log(doc._original);   });  fieldschema   .post('init', function (doc) {     doc._original = doc.toobject();   });

i know doc in post save hook different doc in post init hook, how access original?

you can access properties on database have defined in schema. since haven't defined _original property in schema, can't access, or set it.

one way define _original in schema.

but , set properties not defined in schema: use .get, , .set {strict:false}

fieldschema   .post('save', function (doc) {     console.log(doc.get('_original'));   });  fieldschema   .post('init', function (doc) {     doc.set('_original', doc.toobject(), {strict: false});   });

note option {strict: false} passed .set required because you're setting property not defined in schema.

update:

first thing didn't notice before in question title want pre-save hook in code have post-save hook (which based answer on). hope know you're doing, in post save hook invoked after saving document.

but in opinion, , can understand original intent question, think should use pre-save hook , async version of (by passing next callback), can .find (retrieve) document database, original version since new version hasn't yet been saved (pre-save) enabling compare without saving new fields, seems anti-pattern begin with.

so like:

fieldschema   .pre('save', function (next) {     var new_doc = this;     this.constructor   // ≈ mongoose.model('…', fieldschema).findbyid       .findbyid(this.id, function(err, original){         console.log(original);         console.log(new_doc);         next();       });   });

http://mongoosejs.com/docs/middleware.html


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