deep-copy

I'm .clone -ing a record in rails... new_blerg = Blerg.find(1).clone This record has loads and loads of associations, and those associations even have associations. Is there a way to deep-copy a record and clone it so it is cloned with all of those associations too? Vaughn Draughon You may get some good use out of the Amoeba gem for ActiveRecord 3.2. It supports easy and automatic recursive duplication of has_one , has_many and has_and_belongs_to_many associations, field preprocessing and a highly flexible and powerful configuration DSL that can be applied both to the model and on the fly. be

I searched around and seems in order to perform this I need to change my Base class and want to know if this is the best approach. For example, I have a Base class: class Base {} Then a long line of derived classes: class Derived_1:: public Base {} class Derived_2:: public Derived_1{} ... ... class Derived_n:: public Derived_M{} And then I have another class: class DeepCopy { Base * basePtr; public: DeepCopy(DeepCopy & dc) {} } Assuming the Base class and Derived_x class copy constructors are properly coded, what is the best way to write the copy constructor for DeepCopy. How can we know about

I've been saving all the data received from services direct to local variable, controller, or scope. What I suppose would be considered a shallow copy, is that correct? Example: DataService.callFunction() .then(function(response) { $scope.example = response.data; }); Recently I was told to use angular.copy in order to create a deep copy. $scope.example = angular.copy(response.data); However, the deep copy information seems to be working in the same way when used by my Angular application. Are there specific benefits to using a deep copy (angular.copy) and can you please explain them to me?

How can I deep copy an irregularly shaped 2D array in Java? Ie. int[][] nums = {{5}, {9,4}, {1,7,8}, {8,3,2,10}} I'm unable to use Arrays.arrayCopy() for some reason (versioning?) int[][] copy = new int[nums.length][]; for (int i = 0; i < nums.length; i++) { copy[i] = new int[nums[i].length]; for (int j = 0; j < nums[i].length; j++) { copy[i][j] = nums[i][j]; } } You can replace the second loop with System.arraycopy() or Arrays.copyOf(). I wrote this in Eclipse, tested it, came back and found that João had beaten me to almost exactly the same solution. I upvoted him, but here's mine for

This question already has an answer here: how do I measure the memory usage of an object in python? 2 answers I want to calculate the memory used by an object. sys.getsizeof is great, but is shallow (for example, called on a list, it would not include the memory taken by the list's elements). I'd like to write a generic "deep" version of sys.getsizeof . I understand there is some ambiguity in the definition of "deep"; I'm perfectly happy with the definition followed by copy.deepcopy . Here's my first attempt: def get_deep_sizeof(x, level=0, processed=None): if processed is None: # we're here

I want to make a deep copy of an object so I could change the the new copy and still have the option to cancel my changes and get back the original object. My problem here is that the object can be of any type, even from an unknown assembly. I can not use BinaryFormatter or XmlSerializer , because the object unnecessarily have [Serializable] attribute. I have tried to do this using the Object.MemberwiseClone() method: public object DeepCopy(object obj) { var memberwiseClone = typeof(object).GetMethod("MemberwiseClone", BindingFlags.Instance | BindingFlags.NonPublic); var newCopy =

I have a powershell script in which I do the following $somePSObjectHashtables = New-Object Hashtable[] $somePSObject.Length; $somePSObjects = Import-CSV $csvPath 0..($somePSObject.Length - 1) | ForEach-Object { $i = $_; $somePSObjectHashtables[$i] = @{}; $somePSObject[$_].PSObject.Properties | ForEach-Object { $somePSObjectHashtables[$i][$_.Name] = $_.Value; } } I need to do this because I want to make several distinct copies of the data in the CSV to perform several distinct manipulations. In a sense I'm performing an "INNER JOIN" on the resulting array of PSObject . I can easily iterate