I have a big dictionary with deep hierarchy in it... I want to read it and create another dictionary with same structure but with some modifications while I am reading the source dictionary.
Modifications are like if the keyName is "server" then remove that key, if the keyName is "notification" then alter its value.
What is the best way to do this keeping the structure of source dictionary intact.
Read the Deep Copies section of Collections Programming Topics. In fact, you should really read the entire document. You'll end up reading it all at some point anyway (or worse, having us repeatedly point you there), and it's only a few dozen pages.
I know this probably isn't the answer you were looking for, but the alternative is for someone here to code up a method that deep copies dictionaries for you. I'm not going to do that. If you get stuck on something specific, by all means, ask here.
Related
Prior to allensdk version 0.14.5, the CellTypesCache.get_cells() function returned a large, nested structure containing information about cell morphology, ephys features, location, anatomical structure, tissue donors, etc. In version 0.14.5, the structure returned is flat and much smaller.
I see that some of this information is available through get_ephys_features() and get_morphology_features(), but I'm not sure where to find the rest. Where can I go to find out how to migrate my code to the new allensdk version?
Great question. We simplified the returned dictionary from CellTypesCache.get_cells for a few reasons:
There were a large number of fields that were variously: unexplained, not useful, distracting, and/or redundant with data returned from other functions.
The way brain structures were handled made it very difficult to filter cells by cortical layer across species.
The query involved a large number of joins and was fairly slow.
(2) was probably the most urgent issue we needed to address. The new dictionary structure is explained in a bit more detail here:
https://github.com/AllenInstitute/AllenSDK/wiki/Release-Notes-(0.14.5)
You are correct that you should look for ephys. and morphology features from CellTypesCache.get_ephys_features and CellTypesCache.get_morphology_features (or just CellTypesCache.get_all_features).
If there are any fields you were using in the old dictionary structure that are not now available in the current dictionary, let me know and we can find them again.
I'm working on an Xcode project.
I need to add a dictionary of words, like English dictionary for example. Then, when required, I need to find some words in it.
I have been thinking about creating an array from a file to store all the words, then sort it in some way I don't know and at last do a binary search or something like this to find the word I'm looking for.
Do you think is a good idea?
Do you have any clue to sort the array?
Is binary search a good idea?
The best way would be to use a database (e.g. SQL-based), or CoreData to store it. That is unless you require the words to be entirely in the memory, which would be the case if you often listed all of them. But even then it can be solved by lazy-loading.
I like knockoutjs, the sooner we get rid of coding directly toward the DOM the better. I'm having trouble understanding how I would do something which I'm going to explain in terms of a question/answer site. (This is probably a general MVC/MVVM question)
In my data model I have a question[id, description] and answer[id, question_id, text]. The browser requests a list of questions which is bound to a tbody, one column will display the question description, while the other should be bound to an answer textbox.
One obvious way of doing this is to have a QuestionAnswer[question_id, answer_id, question_descrition, answer_text] model. Ideally I'd like to keep them separate to minimize transformation when sending/receiving/storing, if there isn't some way of keeping them separate then I have the following question:
Where is the ideal place to create the QuestionAnswer model ? My bet is that by convention its created on the server.
If there is such an example somewhere please point me to it, otherwise I think it would make a good example.
Please help me wrap my head around this, Thanks!
What you could do is to create the combined model on the server, serialize it to json and then use the mapping plugin to add the serialized list to the view model.
I'm doing that here only it isn't a combined model, but shouldn't make any difference. Especially since it seems like your relation is one-to-one.
If you need to create an "object" in your view model, you can use the mapping definition to do so, like I do here.
I use C# to build my model on the server, but I guess you can use whatever you are comfortable with.
The cool thing with the mapping plugin is that it adds the data to the view model so that you can focus on behaviour.
Ok,
I'v gathered my thoughts on what my question is actually asking.
To do data binding on the client side you obviously need your data model there as well. I was conflicted on what I needed to send over and at what time.
To continue with the Question/Answer site idea: Sending down a list of answers each of which have a question in them is what should be done. That way you can bind to the answer list and simply bind the question description of each answer to the first table column.
If later I want to make a question editor I would potentially send a complete different data structure down and not reuse the Answer has a Question structure previously used.
I thought there might be a way of sending down a more complex data structure that references itself. Which apparently is possible in JSon with some extra libraries.
I'm trying to clean up a database by first finding unreferenced objects. I have extracted all the database objects into a list, and all the ddl code into files, I also have all the Java source code for the project.
Basically what I want to do (preferably in Perl as it's the scripting language that I'm most familiar with) is to somehow index the contents of all the extracted database ddl and Java files (to speed up the search), step through the database object list and then search through all the files (using the index) to see if those objects are referenced anywhere and create a report.
If you could point me in the right direction to find something that indexes all those files in a way that I can search them (preferably in Perl) I would greatly appreciate it.
The key here is to be able to do this programatically, not manually (using something like Google desktop search).
Break the task down into its steps and start at the beginning. First, what does a record look like, and what information in it connects it to another record? Parse that record, store its unique identifier and a list of the things it references.
Once you have that list, invert it. For each reference, create a list of the objects referenced. Count them by their identifier. You should be able to get the ones whose count is zero.
That's a very general answer, but you asked a very general question. If you are having trouble, break it down into just one of those steps and ask a more specific question, supplying sample data and the code you've tried so far.
Good luck,
An interesting module you might use to do what you want is KinoSearch, it provides you the kind of indexing you said to be looking for. Then you can go through the object identifiers and check if there are references to it.
I would appreciate some help with something I working on and have not done before now and having some proplems because I don't think I understand exactly how to do this. What I'm wanting to do i'm sure is simple to most all of you and will be to me as soon as I do it the first time correctly....anyway.... I have a tableview that I'm needing to populate with two things, a username and a number with a count of items (the username could be a primary key). Currently I have a tableview populating and editable with an array....no problem....I know how to do that.
The two parts I need help with understanding is to:
read a plist with these two values into a dictionary, and read them into two different arrays that I can use with my tables.
Save the arrays back to the dictionary and then back to a plist.
I think I'm getting the most confused with how to store these two things in dictonary keys and values. I've looked that over but just not "getting it".
I would appreciate some short code examples of how to do this or a better way to accomplish the same thing.
As always, thanks for your awesome help....
You can use NSArray method writeToFile: atomically: to dump your data into a file, you can then use initWithContentOfFile to retrieve the information from t hat file just as you dumped it previosly. I believe if you have dictionaries in your array you should be able to get them back this way. You can always use core data as well for storage if you find your structures to store are getting complex and dumping the in a file and getting them back to recreate some o bjects is becoming messy.
The approach that would perhaps be the simplest is to store the data as an array of dictionaries. This has the issue that recreating the array from a plist with mutable leaves is convoluted at best.
But if you can tolerate the performance hit of replacing dictionaries when updating the list instead of modifying them, it might definitely be the simplest course of action.
This also has the added benefit that your datasource only needs to deal with one array, and that the whole shebang would be Key-Value Compliant, which might further simplify your code.