deep-copy

问题 I have a JPA entity (but this question is interesting in general) that consists of multiple child classes (aggregation). I need to create a new entry in the DB that is 90% identical to the existing one (a few business values and of course the IDs need to be different). As we need mapstruct for mapping between entity and TO I was thinking "Can mapstruct do this for me?" After Creating a deep copy I could simply update the remaining fields and persist the object. Writing a copy constructor by

问题 I have a JPA entity (but this question is interesting in general) that consists of multiple child classes (aggregation). I need to create a new entry in the DB that is 90% identical to the existing one (a few business values and of course the IDs need to be different). As we need mapstruct for mapping between entity and TO I was thinking "Can mapstruct do this for me?" After Creating a deep copy I could simply update the remaining fields and persist the object. Writing a copy constructor by

问题 I have a JPA entity (but this question is interesting in general) that consists of multiple child classes (aggregation). I need to create a new entry in the DB that is 90% identical to the existing one (a few business values and of course the IDs need to be different). As we need mapstruct for mapping between entity and TO I was thinking "Can mapstruct do this for me?" After Creating a deep copy I could simply update the remaining fields and persist the object. Writing a copy constructor by

问题 This question already has answers here : How do you make a deep copy of an object? (19 answers) Closed 4 years ago . I first noticed this problem when I only put the objects in listOfRates and then created inverseListOfRates by copying it. But even using this method, I can't alter one list without altering the other. How do I solve this issue? List<HistoricRate> listOfRates = new ArrayList<HistoricRate>(); List<HistoricRate> inverseListOfRates = new ArrayList<HistoricRate>(); for

问题 This question already has answers here : How do you make a deep copy of an object? (19 answers) Closed 4 years ago . I first noticed this problem when I only put the objects in listOfRates and then created inverseListOfRates by copying it. But even using this method, I can't alter one list without altering the other. How do I solve this issue? List<HistoricRate> listOfRates = new ArrayList<HistoricRate>(); List<HistoricRate> inverseListOfRates = new ArrayList<HistoricRate>(); for

问题 This question already has answers here : How do you make a deep copy of an object? (19 answers) Closed 4 years ago . I first noticed this problem when I only put the objects in listOfRates and then created inverseListOfRates by copying it. But even using this method, I can't alter one list without altering the other. How do I solve this issue? List<HistoricRate> listOfRates = new ArrayList<HistoricRate>(); List<HistoricRate> inverseListOfRates = new ArrayList<HistoricRate>(); for

问题 I am using NGXS for a while and found that if you use an object or array in @Select return it can break the immutability of the sate in the component. Example: state: AppStateModel = { justValue: true, complexObject: { a:1, b:2} } and then two selectors: // Here in a component we will get access to object by link and can modify it in state without patchState or setState @Selector() static getComplexObject(state: AppStateModel) { return state.complexObject; } // That will work fine since JS

问题 In vue.js what is the right way to edit prop without changing parent data? What I mean by that is whenever we pass any property from parent to child in vue.js then if we make any change to that property in child component then the change is also reflected in parent's component. Is there any way in vue.js to make a local copy of passed property in a child? I googled this but everywhere it is written that we can achieve this by doing this. props:["user"], data(){ return { localUser: Object

来源： https://stackoverflow.com/questions/56355212/deep-copying-data-structures-in-golang

来源： https://stackoverflow.com/questions/56355212/deep-copying-data-structures-in-golang