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• Seeking Functional Programming Lexicon

  - by Randall Schulz

  Hi, Knowing the argot of a field helps me a lot, especially since it allows me to converse intelligently with those who know a lot more than I, so I would like to find a good lexicon of Functional Programming terms. E.g., I repeatedly encounter these: Functor, Arrow, Category, Kleisli, Monad, Monoid, a veritable zoo of Morphisms, etc. I also notice many of these appear with prefixes such as "covariant", "co-", "endo-" etc. Of these, I can say I actually understand Monoid and Covariant and sort of get Monad, but the rest are still gibberish to me. (Note that I don't mean this list as exhaustive and I'm not looking to have these defined or described for me here, I'm looking for learning resources.) Can someone point me towards an FP lexicon? It need not be on-line, as long as it's possible to find it (and it's not a rare volume for which I'd have to pay many tens of dollars).

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• Query and/or Search for SharePoint Document ID

  - by Paul-Jan

  We have the sharepoint 2010 environment with Document ID's enabled. Given (part of) a Doc ID, we want to programmatically retrieve the document(s) matching that ID. The problem seems to be that this column is rather special, in that it might need special handling. Using an SPSiteDataQuery, fetching the _dlc_DocId field as part of the viewfields works fine. However, including it as part of the where query never results in any documents being fetched. Using the Search API has gotten us nowhere at all. Has anyone pulled this off, or any suggestions on how to tackle this problem? [Update] Looks like DocumentIdProvider.GetDocumentUrlsById might be used for this purpose. If necessary, the matching SPListItem can then be found by querying on the URL. However, the MSDN documentation doesn't document the documentId arugment properly, so I'm unsure whether partial ID's are allowed and in what format.

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• What's the right way to calculate derived data in a Flex AdvancedDataGrid using summaries?

  - by Chris R

  Here's the gist of the problem: I have a set of rows of data with (say) field1 to field4 in them. I'm using a GroupingCollection to group on field1 and field2. So, I have something like this: f1.1 f2.1 f3.1 f4.1 f3.2 f4.2 f2.2 f3.3 f4.3 f3.4 f4.4 f3.5 f4.5 f1.2 f2.1 f3.6 f4.6 f2.2 f3.7 f4.7 f3.8 f4.8 f3.9 f4.9 (or at least, I hope that's clear enough) I need to calculate some derived values for each leaf row, for example f3, that is the ratio of f3 to the average of all f3 in that particular part of the tree. So, for f3.7 I need to calculate f3.7 / avg(f3.7..f3.9) and fill that into the f3_index property on the row, displaying that in lieu of f3 itself. So, basically, what it looks like I have to do is add source field values in the summarizeFunction implementation. It seems to me that there must be a better way of doing this. Is there?

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• Reading XML using XDocument & Linq - check if element is NULL?

  - by adchased

  I'm using LINQ together with XDocument to read a XML File. This is the code: XDocument xml = XDocument.Load(filename); var q = from b in xml.Descendants("product") select new { name = b.Element("name").Value, price = b.Element("price").Value, extra = b.Element("extra1").Value, deeplink = b.Element("deepLink").Value }; Now the problem is, the extra1 field is not always present. There are items in the XML file without that node. If that happens it's crashing with a NullReferenceException. Is there any possibility to include a "check if null" so I can prevent it from crashing?

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• How to dynamically choose two fields from a Linq query as a result

  - by Dr. Zim

  If you have a simple Linq query like: var result = from record in db.Customer select new { Text = record.Name, Value = record.ID.ToString() }; which is returning an object that can be mapped to a Drop Down List, is it possible to dynamically specify which fields map to Text and Value? Of course, you could do a big case (switch) statement, then code each Linq query separately but this isn't very elegant. What would be nice would be something like: (pseudo code) var myTextField = db.Customer["Name"]; // Could be an enumeration?? var myValueField = db.Customer["ID"]; // Idea: choose the field outside the query var result = from record in db.Customer select new { Text = myTextField, Value = myValueField };

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• Tablesorter, Color rows depending on an specific value

  - by vikitor

  Hi all, I've been looking around for a solution to this thing but I haven't found anything similar to what I'm looking for. The thing is that I've got a table filled with data from a database, and what I want is to change the background colour of an specific row depending on a value of the class I'm loading in each row. The thing is that I have to display some data but as the fields to be displayed are quite a lot, I don't have more space to show an status field, so I would like to show the row in red if the status is inactive, and the rest of the rows in the normal color of the blue stylesheet. Is there a way to do that through tablesorter? I'm opened to suggestions, as I'm not sure how to do it. Thank you all in advance, Victor

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• GWT uibinder composite

  - by Han Fastolfe

  I'm creating a composite uibinder widget with a Label and a TextBox. The intented use is: <x:XTextBox ui:field="fieldName" label="a caption" > The text to be put in the box. </x:XTextBox> I've found how to catch the label with a custom @UiConstructor constructor, I might add another parameter to the constructor, but I would like to know how to get the text from the xml, just like the GWT tag <g:Label>a caption</g:Label> does. Any help is greatly appreciated.

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• Fields of class, are they stored in the stack or heap?

  - by Mirek

  I saw a question yesterday which raised (for me) another question. Please look at the following code: public class Class1 { int A; //as I uderstand, int is value type and therefore lives in the stack } class Class2 { Run() { Class1 instance1 = new Class1(); instance1.A = 10; //it points to value type, but isnt this reference (on heap)? } } Or while creating the instance of Class1, its field types are created on the heap as well? But then I do not understand when it would really be on the stack as almost always you need to create an instance of object in order to use it fields.

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• jQuery Validate - resetForm() Not Behaving as Expected

  - by Kevin C.

  Site in question is http://epraxadev.com/kw/palisade-palms/ "Click here for brochure" and "Learn More about Palisade Palms" both bring up a lightbox with the same HTML form to be filled out...the "learn more..." link also changes some of the HTML in the form (the value for a hidden form field, and the fields required). I'm using Colorbox for the lightbox, and for its onClosed event, I have this to reset the form: onClosed: function() { $('#brochure-form label em').remove(); $('#brochure-form').data('validator').resetForm(); } Now here's the problem: User tries to submit the "brochure" form, but it fails validation. User closes the lightbox. User opens up the "Learn more" lightbox, and tries to submit the form...now, instead of using the correct validation rules (only requiring e-mail and referrer), it requires all fields to be filled out (as is the case with the "Brochure Form") Is there something that I can add to the onClosed function, to clean up all the validation rules? Thanks guys!

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• How to hold three different text alignments in one CSS Box ?

  - by UXdesigner

  Good day, I've got a simple CSS question. I'm trying to change a table into a CSS box, but aligning the table content is difficult to me right now. Below there's an example of what's inside of the css box i created. How can I align these three elements (calendar and icon to the left , a text link to the center, and the other date field to the right ?) correctly ? I've tried several things but the problem is getting it aligned properly. I want to change everything in this application that has been created with tables, to css. And I've been an 80% succesful so far. I'd like to see some easy to understand code, to see how I can apply it on my code. Thank you for your kind help. I might be burned out due to stress. [Calendar (icon) Link Date]

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• ExpressionEngine: {exp:query} producing error

  - by Josh Brown

  Hi. I have this code in place to pull some relation data from the database based on a ID of another weblog entry. The relationship custom field would not work for my situation. I have tested the SQL with MySQL and get no errors. But I get an error when I pull up the page. {exp:query sql="SELECT entry_id,field_id_16,field_id_19 FROM exp_weblog_data WHERE field_id_15='2' AND weblog_id='6'"} Also, I want to populate the “field_id_15” from the url. I have tried using the “segment_*” tag, but nothing. Maybe it is something else. Any help is greatly appreciated. Thanks, Josh

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• Help me with a solution for what could be solutioned by virtual static fields... in FPC

  - by Gregory Smith

  Hi I'm doing an event manager in Freepascal Each event is an object type TEvent (=object), each kind of event must derive from this class. Events are differentiated by an integer identificator, assigned dynamically. The problem is that i want to retrieve the event id of an instance, and i can't do it well. All instances of a class(object) have a unique id = so it should be static field. All classes have a diferent id = so it should be virtual. Event ids are assignated in run time, and can change = so it can't be a simple method In sum, I can't put all this together. I'm looking for an elegant solution, i don't want to write a hardcoded table, actualizing it in every constructor... etc, i'd prefer something taking advantage of the polymorphism Can anyone help me with another technical or design solution? I remark I don't want to use class instead of object construct.(property doesn't work on objects? :(

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• relational database: how to design this table

  - by donpal

  I'm a database newbie designing a database. I'll use SO to ask my question because it's easier to ask it on something that you can see already, but it's not the same, it will just help me understand the right approach. As you can see, there are many questions here and each can have many answers. How should I store the answers in a table? Should I store all the answers in the SAME table with a unique id (make it the key) and just a new field for the question id? What if there are 100,000 answers like there is here? Do I still store them in 1 table? What keys should I use to minimize search time when I want to search for the answers of a specific question? The database is both read and write if that makes any difference in this case.

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• Word mergefield wildcard not correctly matching

  - by aZn137

  Hello, Below is my mergefield code: { IF { MERGEFIELD Subs_State } = "GA" "blah blah" "{ IF { MERGEFIELD CEOrgStates } = "GA" "blah blah" ""} "} I'm pulling records from a MS Access db. My goal is to check whether a record has Subs_State field matching "GA", or the CEOrgStates has the word "GA" (some records have stuff like "|FL|CA|GA|CT|KY|" (no quotes)). When I merged the docs, Word doesnt seem to be able to match with the wildcards: If I use and compare "*GA" (fields ending with GA), it works; however, the double wildcards "*GA*" dont seem to work at all. Here are the things I’ve tried: Have data in lowercase, then compare with lowercase Have data in lowercase, convert to and then compare with uppercase Do the opposite of the above 2 with uppercase data Use “*GA*” and “*ga*” (no pipe) Use different delimiters Nothing seems to work with the double wildcard matching. What am I doing wrong? Thanks!

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• How to set up weekends in richfaces calendar?

  - by Elena

  Hi all! I want to change next example: http://livedemo.exadel.com/richfaces-demo/richfaces/calendar.jsf?tab=organizer&cid=1157294 to have ability to set up weekends and hollydays. And I have q few questions: 1) why I could use data.shortDescription/data.description in the next code: <div> <h:outputText value="{data.shortDescription.escapeHTML()}" /> </div> <div> <h:outputText value="{data.description.escapeHTML()}"/> </div> Can I use something else to show the text in the current date? I want to add boolean isDayOff field to CalendarDataModelItemImpl, but I don't know, how I will retrieve it and show, and also save. Could anyone give me some ideas or example? Also I need to show this new weekends with red color.

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• Is it possible to calculate distance on GeoDjango in a SELECT statement?

  - by alex

  I am using MYSQL. I have a table with 1 column, a Point field. I want to SELECT all rows that have a point with a distance less than 50 meters of my given point. Simple enough, right? Below is how it's done in RAW SQL. But of course, I want to use GeoDjango to do this. cursor.execute("SELECT * FROM project_location WHERE\ (GLength(LineStringFromWKB(LineString(asbinary(utm), asbinary(PointFromWKB(point(%s, %s)))))) < 50)\

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• Select a subset of foreign key elements in inlineformset_factory in Django

  - by Enis Afgan

  Hello, I have a model with two foreign keys: class Model1(models.Model): model_a = models.ForeignKey(ModelA) model_b = models.ForeignKey(ModelB) value = models.IntegerField() Then, I create an inline formset class, like so: an_inline_formset = inlineformset_factory(ModelA, Model1, fk_name="model_a") and then instantiate it, like so: a_formset = an_inline_formset(request.POST, instance=model_A_object) Once this formset gets rendered in a template/page, there is ChoiceField associated with the model_b field. The problem I'm having is that the elements in the resulting drop down menu include all of the elements found in ModelB table. I need to select a subset of those based on some criteria from ModelB. At the same time, I need to keep the reference to the instance of model_A_object when instantiating inlineformset_factory and, therefore, I can't just use this example. Any suggestions?

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• Can MySQL Nested Select return list of results

  - by John

  Hi I want to write a mysql statement which will return a list of results from one table along with a comma separated list of field from another table. I think an example might better explain it Table 1 ======================== id First_Name Surname ---------------------- 1 Joe Bloggs 2 Mike Smith 3 Jane Doe Table 2 ======================== id Person_Id Job_id --------------------- 1 1 1 2 1 2 3 2 2 4 3 3 5 3 4 I want to return a list of people with a comma separated list of job_ids. So my result set would be id First_Name Surname job_id ------------------------------ 1 Joe Bloggs 1,2 2 Mike Smith 2 3 Jane Doe 3,4 I guess the sql would be something like select id, First_Name, Surname, (SELECT job_id FROM Table 2) as job_id from Table 1 but obviously this does not work so need to change the '(SELECT job_id FROM Table 2) as job_id' part. Hope this makes sense Thanks John

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• Web Services: more frequent "small" calls, or less frequent "big" calls

  - by Klay

  In general, is it better to have a web application make lots of calls to a web service getting smaller chunks of data back, or to have the web app make fewer calls and get larger chunks of data? In particular, I'm building a Silverlight app that needs to get large amounts of data back from the server in response to a query created by a user. Each query could return anywhere from a few hundred records to a few thousand. Each record has around thirty fields of mostly decimal-type data. I've run into the situation before where the payload size of the response exceeded the maximum allowed by the service. I'm wondering whether it's better (more efficient for the server/client/web service) to cut this payload vertically--getting all values for a single field with each call--or horizontally--getting batches of complete records with each call. Or does it matter?

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• Why does appending "" to a String save memory?

  - by hsmit

  I used a variable with a lot of data in it, say String data. I wanted to use a small part of this string in the following way: this.smallpart = data.substring(12,18); After some hours of debugging (with a memory visualizer) I found out that the objects field smallpart remembered all the data from data, although it only contained the substring. When I changed the code into: this.smallpart = data.substring(12,18)+""; ..the problem was solved! Now my application uses very little memory now! How is that possible? Can anyone explain this? I think this.smallpart kept referencing towards data, but why? UPDATE: How can I clear the big String then? Will data = new String(data.substring(0,100)) do the thing?

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• Creating Zend_Form elements from row html

  - by P.M

  Hi there, I am having an issue with Zend_Form and your help will be appreciated. in fact I have a class to generate categories as options $categories = My_Util_Category::toHtmlSelect();//for simplicity I removed other lines this code generates <select> <option > root</option> <option> root / children</option> </select> On another hand, I use Zend_Form form to edit categories. The code looks like: $form = My_Form_Category( $data, $selectElements = array() ); which outputs a form, text field, a select box for parent categories and a submit button. How can I get 'select element' from $form, and replace it with row html 'select' generated with $categories any help, or link will be appreciated. Thanks.

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• How to get Wordpress MU / BuddyPress wp_signup meta data

  - by Ryan

  I am trying to get a value from the meta data that is stored in the wp_signups table for a Wordpress MU / BuddyPress installation. I see it's stored in the meta field as s:3:"age";s:2:"25"; ...which is age = 25 I put the information there using $usermeta['age'] = $_POST['signup_age']; in a plugin subscribing the the bp_signup_usermeta filter. I need to get it back during a function subscribing to bp_before_activate_content. How can I do this? Whats the function call? (searched documentation to no avail)

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• Validate password on change of certain fields in RoR

  - by Micke

  Hello, I am building a RoR app, a community. With a User model and some fields. So when a user is updating a certain field, like His/Hers berthday. Then i want to validate that the User typed in the password that is the same in the Database. So I know that it is the right user trying to change the birthday. So i ask you how i can create shuch a validator. Allso i would like to be able to specify an array of which fields the user has to validate the password to change. Ps. I am using RoR3. If it mathers. Thanks, Micke

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• PowerShell: Retrieve a specific internal XML element

  - by rursw1

  Hi, I have an XML document with this structure: <Fruits> <Fruit> <Code>1</Code> <Name>Apple</Name> </Fruit> </Fruits> What is the best way to get a <Fruit> element by its code (or any other field) in PowerShell 1 code? (Not XPath, as it is supported in PowerShell 2 only) Thanks!

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• open source alternatives to popular websites

  - by Richard

  Hello, The other day I came across Jaiku, which is a well structured microblogging system open sourced by Google. It surprised me I had never heard about this, so I was wondering what other open source alternatives exist for mainstream websites? I am not asking about forums, eCommerce, wiki's, CMS's, etc, where the market leaders are already well known open source applications (phpBB, osCommerce, Mediawiki, Drupal). But what about open source alternatives for: Social networking (Facebook)? Classified advertising (Craigslist)? Jobs (CareerBuilder)? Dating (eHarmony)? Or any other field that is defined by a commercial website, as Twitter does for microblogging.

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