My laravel app is a big family tree website. I have Person records (id, first, last, DOB, parent_family_id, etc) and Family records (id, caption, mother_id, father_id, original_bool).
Everything's done now except for my last challenge: an outline view! I have a number of 'original families' (the earliest ones), and for each of them I'd like to be able to display their descendants all the way down to present day in an outline form (kids, those kids' families, those families' kids, etc).
So far I've written a few functions in the relevant controller:
get_kids_of_family($family)
get_families_person_made($person)
get_descendants($family, $results)- this will be a recursive function that calls get_kids_of_family, adds them to a results set (some gigantic array that I'll pass along?), then for each of them it calls get_families_person_made, adds them to the results set, calls get_descendants on each of those families, etc.
Then it occurred to me: even if I can get this working, it'll be crunching around through a lot of data, and it rarely changes (weekly/monthly at most, with the discovery of a new person). Therefore I'm wondering if it makes sense to make/run a script to save the results someplace (like an xml or json file) and then somehow pass that file to my view for display.
Thoughts? What's a good (but not too advanced) way to implement something like this in a laravel app?
Thanks in advance for your help!
Related
I'm trying to figure out how to re-position sheets in Numbers. There is no way to insert things at specific location so I am hoping that I can find another way. The move verb drew my attention (it is in the Numbers dictionary) however there is little or no information, examples, usage scenarios or even what object types it works with.
Any insight in the context of the title?
The move in the Numbers dictionary is part of the Standard Suite, which typically works with files. I have tried using it to move text items and tables from one sheet to another, but it always fails. It is probably something they hope to provide functionality for some day.
Here's what I'd like to do with Lift: I want to build a dynamic shopping cart, with lines able to be added and removed via AJAX calls. The total needs to be wired to the specific lines. Each line would include a number, the length of time for a lease, and a calculated price based on that, so I would have to add wired cells on each addable/removable line as well. So it would look something like this:
Number Length of Lease Price Remove?
(AJAX Textbox) (AJAX Dropdown Select) (Plain Updateable Text) (Ajax Checkbox)
(Another Row)...
+ Add
Total: ______
The problem I'm running into is that I can find resources to build a static page that displays all of this via Wiring. Using the Lift Demo site, I can pull up code that will let me add new lines, but it doesn't seem to me to be conducive to removing lines (this in general is one of my frustrations with Lift at the moment: a "little extra detail" to change from a tutorial ends up requiring me to completely change tacks and spend hours more at work and research, and I want to figure out how I'm probably approaching these problems wrongly!). Alternatively, I can use CSS selectors to dynamically create content, but I don't know how to effectively wire these together.
In addition, all of my attempts end up creating 2-3 times the amount of code I would have written to simply do some JQuery updates on the page, so I suspect that I'm doing something wrong and overcomplicating everything.
What resources would people recommend to set me on the right path?
These are your best resources for learning Lift:
Simply Lift
Lift Cookbook
Lift in Action
For any specific questions, I highly recommend you join us at the Lift Community Google Group. It is the official support channel for Lift. Although a few of us occasionally help out here at Stackoverflow, the best Lift help can be found there.
I am creating an application with a lot of links. Because the links are contained in cells in a table, the urls that are generated by Wicket tend to get long, making the page slower to load.
For example:
2011-06-09 00:00:00.0
I try to figure out where to start exploring the encoding / decoding of URLs, but it is rather complex material. My first approach was to just use 'short' names for components (like "t", "f" etc). I can imagine there is a better approach.
I can image it would be possible just to 'number' the links; as the page still exists, so I would end up with something like this:
2011-06-09 00:00:00.0
Are there solutions for my problem already out there, or can anyone point me to the right direction?
If a Javascript solution is acceptable, you can use a single event listener on the whole table instead of many links in the table.
See this example for an inspiration:
https://github.com/svenmeier/apachecon-wicket/tree/master/src/main/java/eu/apachecon/base/ui/performance
Notice how the Ajax behavior transports dynamic extra parameters to the server. It looks for rows only though. if you need to distinguish between table cells being clicked, you'll have to expand on the idea.
The solution suggested by Sven is the better solution.
Here is a solution which you may call fundamental: register your own root IRequestMapper that will compress/uncompress the generated urls by the real mappers. See CryptoMapper and HttpsMapper for example of custom root mapper.
I am new at the idea of programming algorithms. I can work with simplistic ideas, but my current project requires that I create something a bit more complicated.
I'm trying to create a categorization system based on keywords and subsets of 'general' categories that filter down into more detailed categories that requires as little work as possible from the user.
I.E.
Sports >> Baseball >> Pitching >> Nolan Ryan
So, if a user decides they want to talk about "Baseball" and they filter the search, I would like to also include 'Sports"
User enters: "baseball"
User is then taken to Sports >> Baseball
Now I understand that this would be impossible without a living - breathing dynamic program that connects those two categories in some way. It would also require 'some' user input initially, and many more inputs throughout the lifetime of the software in order to maintain it and keep it up to date.
But Alas, asking for such an algorithm would be frivolous without detailing very concrete specifics about what I'm trying to do. And i'm not trying to ask for a hand out.
Instead, I am curious if people are aware of similar systems that have already been implemented and if there is documentation out there describing how it has been done. Or even some real life examples of your own projects.
In short, I have a 'plan' but it requires more user input than I really want. I feel getting more info on the subject would be the best course of action before jumping head first into developing this program.
Thanks
IMHO It isn't as hard as you think. What you want is called Tagging and you can do it Automatically just by setting the correlation between tags (i.e. a Tag can have its meaningful information plus its reation with other ones. Then, if user select a Tag well, you related that with others via looking your ADT collection (can be as simple as an array).
Tag:
Sport
Related Tags
Football
Soccer
...
I'm hoping this helps!
It sounds like what you want to do is create a tree/menu structure, and then be able to rapidly retrieve the "breadcrumb" for any given key in the tree.
Here's what I would think:
Create the tree with all the branches. It's okay if you want branches to share keys - as long as you can give the user a "choice" of "Multiple found, please choose which one... ?"
For every key in the tree, generate the breadcrumb. This is time-consuming, and if the tree is very large and updating regularly then it may be something better done offline, in the cloud, or via hadoop, etc.
Store the key and the breadcrumb in a key/value store such as redis, or in memory/cached as desired. You'll want every value to have an array if you want to share keys across categories/branches.
When the user selects a key - the key is looked up in the store, and if the resulting value contains only one match, then you simply construct the breadcrumb to take the user where you want them to go. If it has multiple, you give them a choice.
I would even say, if you need something more organic, say a user can create "new topic" dynamically from anywhere else, then you might want to not use a tree at all after the initial import - instead just update your key/value store in real-time.
I've been reading up on LINQ lately to start implementing it, and there's a particular thing as to how it generates UPDATE queries that bothers me.
Creating the entities code automatically using SQLMetal or the Object Relational Designer, apparently all fields for all tables will get attribute UpdateCheck.Always, which means that for every UPDATE and DELETE query, i'll get SQL statement like this:
UPDATE table SET a = 'a' WHERE a='x' AND b='x' ... AND z='x', ad infinitum
Now, call me a purist, but this seems EXTREMELY inefficient to me, and it feels like a bad idea anyway, even if it weren't inefficient. I know the fetch will be done by the clustered primary key, so that's not slow, but SQL still needs to check every field after that to make sure it matches.
Granted, in some very sensitive applications something like this can be useful, but for the typical web app (think Stack Overflow), it seems like UpdateCheck.WhenChanged would be a more appropriate default, and I'd personally prefer UpdateCheck.Never, since LINQ will only update the actual fields that changed, not all fields, and in most real cases, the second person editing something wins anyway.
It does mean that if two people manage to edit the same field of the same row in the small time between reading that row and firing the UPDATE, then the conflict that would be found won't be fired. But in reality that's a very rare case. The one thing we may want to guard against when two people change the same thing won't be caught by this, because they won't click Submit at the exact same time anyway, so there will be no conflict at the time the second DataContext reads and updates the record (unless the DataContext is left open and stored in Session when the page is shown, or some other seriously bad idea like that).
However, as rare as the case is, i'd really like to not be getting exceptions in my code every now and then if this happens.
So my first question is, am I wrong in believing this? (again, for "typical" web apps, not for banking applications)
Am I missing some reason why having UpdateCheck.Always as default is a sane idea?
My second question is, can I change this civilizedly? Is there a way to tell SQLMetal or the ORD which UpdateCheck attribute to set?
I'm trying to avoid the situation where I have to remember to run a tool I'll have to make that'll take some regexes and edit all the attributes in the file directly, because it's evident that at some point we'll run SQLMetal after an update to the DB, we won't run this tool, and all our code will break in very subtle ways that we probably won't find while testing in dev.
Any suggestions?
War stories are more than welcome, i'd love to learn from other people's experiences on this.
Thank you very much!
Well, to answer the first question - I agree with you. I'm not a big fan of this "built in" optimistic concurrency, especially if you have timestamp columns or any fields which are not guaranteed to be the same after an update occurs.
To address the second question - I don't know of any way to override SqlMetal's default approach (UpdateCheck = Always), we ended up writing a tool which sets UpdateCheck = Never for appropriate columns. We're using a batch file to call SqlMetal and afterwards running the tool).
Oh, while I think of it - it was also a treat to find that SqlMetal also models relationships to set a foreign key to null instead of "Delete On Null" (for join tables in particular). We had to use the same post-generation tool to set these appropriately too.