parent-child

问题 Thanks to Ruby on Rails: How to gather values for child tables from a form? and "Agile Web Dev", I know how to have multiple models in a form using fields_for . But I'm tearing my hair out over this one. Suppose I have a model Person . Person has a name attribute, and has_many :foos . The Foo model, in turn, has a colour attribute. Furthermore, I know that each Person has precisely three Foos . What should my Models, the new and create actions in PersonController , and the new view look like

问题 I have this code that is supposed to create three child process' and each will perform a small mathematical operation. Then, the parent is supposed to use the results from all the child process' and get a final answer but I can't find a way to actually read the result from the child in the parent. Is there a way to do this? #include <stdio.h> #include <unistd.h> #include <stdlib.h> int main(void) { int pid1, pid2, pid3, status; int a=1, b=2, c=5, d=4, e=6, f=3, g; int t1, t2, t3; printf(

问题 I can pass in a Child to a member function expecting a Parent, however when using vectors I get a compile error saying there's no matching declaration. See the CorrelationEngineManager.cpp call to getUniqueLabels() at the bottom ServerEvent.h #ifndef SERVEREVENT_H #define SERVEREVENT_H #define SERVEREVENT_COLS 3 #include "Event.h" #include <vector> class ServerEvent: public Event { private: public: ServerEvent(std::vector<std::string> tokens); void print(); }; #endif Event.h #ifndef EVENT_H

问题 im working on a method to find the parent of anode. I start at the root and then go down the leaves as long as they are not null and not the node of the child. below is my code, its a little messy because im trying to test it to see whats going wrong. The tree that i have is 10 / \ 2 20 \ / \ 3 18 22 / 21 The x that is being passed in is 20 so 10 is the parent but when i run it 22 comes out as the parent. the while loop seems to not be working, is it the way ive written it? public Node<E>

问题 im working on a method to find the parent of anode. I start at the root and then go down the leaves as long as they are not null and not the node of the child. below is my code, its a little messy because im trying to test it to see whats going wrong. The tree that i have is 10 / \ 2 20 \ / \ 3 18 22 / 21 The x that is being passed in is 20 so 10 is the parent but when i run it 22 comes out as the parent. the while loop seems to not be working, is it the way ive written it? public Node<E>

问题 im working on a method to find the parent of anode. I start at the root and then go down the leaves as long as they are not null and not the node of the child. below is my code, its a little messy because im trying to test it to see whats going wrong. The tree that i have is 10 / \ 2 20 \ / \ 3 18 22 / 21 The x that is being passed in is 20 so 10 is the parent but when i run it 22 comes out as the parent. the while loop seems to not be working, is it the way ive written it? public Node<E>

问题 im working on a method to find the parent of anode. I start at the root and then go down the leaves as long as they are not null and not the node of the child. below is my code, its a little messy because im trying to test it to see whats going wrong. The tree that i have is 10 / \ 2 20 \ / \ 3 18 22 / 21 The x that is being passed in is 20 so 10 is the parent but when i run it 22 comes out as the parent. the while loop seems to not be working, is it the way ive written it? public Node<E>

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . So I know there is no such thing as a "global" variable in C# but I am trying to pass a string from my site.master page to a child page. I would like my search button on my master page to pass the value of a textbox on the master page to a "global" string, then have the child page

问题 I'm creating a billing application in rails3, I have a confusion when it comes to creating a bill. one bill can have one or more items 'bill' has many 'items' 'item' belongs to 'bill' my requirement is as follows I should be able to create a new bill and add items to it (any number of items can be added) my problem is 1 - to get items to be saved in the bill_details table I should first generate bill_id, What is the best way to generate this bill id. 2 - what is the best way to implement a

问题 I'm creating a billing application in rails3, I have a confusion when it comes to creating a bill. one bill can have one or more items 'bill' has many 'items' 'item' belongs to 'bill' my requirement is as follows I should be able to create a new bill and add items to it (any number of items can be added) my problem is 1 - to get items to be saved in the bill_details table I should first generate bill_id, What is the best way to generate this bill id. 2 - what is the best way to implement a