将外部函数返回的id传递给内部函数

Passing id returned by outer function to inner function

本文关键字：内部函数 id 外部 函数 返回      更新时间：2023-09-26

我在事件处理程序中有一个嵌套函数。外部函数从Trees集合创建文档的副本。然后，内部函数从Branches集合中创建任何文档的副本，这些文档的ID包含在原始树文档的treeBranches字段中的数组中。

我需要将newTreeId从外部函数传递到内部函数，以便可以将新的分支ID添加到新文档中的数组中。内部函数中的console.log(newTreeID)当前返回未定义。

Template.Actions.events({
    'change .action-selection': function(e) {
        e.preventDefault();
        var selection = $(e.target).val();
        var currentTreeId = this._id;
        var branches = Branches.find({_id:{$in:this.treeBranches}});
        switch(selection) {
            case "repeat":
                return Meteor.call('treeRepeat', currentTreeId, function (newTreeId) {
                    branches.forEach(function(b) {
                        var currentBranchId = b._id;
                        console.log(newTreeId);
                        Meteor.call('treeBranchesRepeat', currentBranchId, newTreeId, function () {
                        });
                    });
                });
                break;
                ...
Meteor.methods({
    treeRepeat: function(currentTreeId) {
        check(currentTreeId, String);
        var tree = Trees.findOne({_id:currentTreeId}, {fields:{_id:0, treeBranches:0}});
        var newTreeId = Trees.insert(tree);
        return {
            _id: newTreeId
        };
    },
    treeBranchesRepeat: function(currentBranchId, newTreeId) {
        check(currentBranchId, String);
        check(newTreeId, String);
        var branch = Branches.findOne({_id:currentBranchId}, {fields: {_id: 0}});
        var newBranchId = Branches.insert(branch);
        Trees.update({_id:newTreeId},{$push:{treeBranches:newBranchId}});
        return {
            _id: newBranchId
        };
    }
});

我认为这可以通过在向服务器发出一个请求时执行树和分支的所有复制来简化。建议以下工作流程（未经测试，但我认为你已经明白了）：

Template.Actions.events({
    'change .action-selection': function(e) {
        e.preventDefault();
        var selection = $(e.target).val();
        var currentTreeId = this._id;
        var currentTreebranches = this.treeBranches;
        switch(selection) {
            case "repeat":
                return Meteor.call('treeAllRepeat', currentTreeId, currentTreebranches, function (err, res) {
                  if (err) { console.log(err); }
                  console.log(res); // Your new tree _id
                });
                break;
                ...
Meteor.methods({
    treeAllRepeat: function(currentTreeId, branchIds) {
        check(currentTreeId, String);
        check(branchIds, [String]);
        var tree = Trees.findOne({ _id: currentTreeId }, { fields: { _id: 0, treeBranches: 0 } });
        if (!tree) {
          throw new Error('Tree with id ' + currentTreeId + ' not found');
        }
        var newTreeId = Trees.insert(tree);
        var branches = Branches.find({ _id: { $in: branchIds || [] } });
        branches.forEach(function (branch) {
          var newBranch = Branches.findOne({ _id: branch._id }, { fields: { _id: 0 } });
          var newBranchId = Branches.insert(newBranch);
          Trees.update({ _id: newTreeId }, { $push: { treeBranches: newBranchId } });
        });
        return {
          _id: newTreeId
        };
    }
});

我假设this.treeBranches是分支的id？如果没有，你可能想做一些类似的事情：

var currentTreebranches = _.pluck(this.treeBranches, '_id');

PS。如果删除了autopublish软件包，请记住不要订阅新的树。

相关文章：