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Search found 510 results on 21 pages for 'jeffrey lin'.

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• TextMate can show definition of a function easily?

  - by Jian Lin

  I am using TextMate on a Ruby on Rails project and wonder if you can put the mouse on link_to, and then press a key and it will show the definition of link_to, or does this for any other helper functions? Or, click open a box and type in a function name and it will show you the definition?

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• In SQL, why is "Distinct" not used in a subquery, when looking for some items "not showing up" in th

  - by Jian Lin

  Usually when looking for some items not showing up in the other table, we can use: select * from gifts where giftID not in (select giftID from sentgifts); or select * from gifts where giftID not in (select distinct giftID from sentgifts); the second line is with "distinct" added, so that the resulting table is smaller, and probably let the…

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• In Javascript, a function starts a new scope, but we have to be careful that the function must be in

  - by Jian Lin

  In Javascript, I am sometimes too immerged in the idea that a function creates a new scope, that sometimes I even think the following anonymous function will create a new scope when it is being defined and assigned to onclick: <a href="#" id="link1">ha link 1</a> <a href="#" id="link2">ha link 2</a> <a href="#"…

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• Is it true that in most Object Oriented Programming Languages, an "i" in an instance method always r

  - by Jian Lin

  In the following code: <script type="text/javascript"> var i = 10; function Circle(radius) { this.r = radius; this.i = radius; } Circle.i = 123; Circle.prototype.area = function() { alert(i); } var c = new Circle(1); var a = c.area(); …

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• In Javascript, if there is an object with a lot of properties that can functions, how do you convert

  - by Jian Lin

  In Javascript, if an object has lots of properties that are functions: var obj = { foo: function() { ... }, bar: function() { ... }, ... } then how can you get an array of names of those functions? That is, an array ["foo", "bar", ... ] thanks.

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• In CSS, does it make sense or is it legal to nest an id in another id -- such as "#main #display img

  - by Jian Lin

  In CSS, if it is #main #display img { height: 80px } that means all images within an element with id display that is within another element with id main. But does it make sense or is it legal since id seems to be just global names. It is because SASS actually allow nesting and some code may nest it like #main width: 700px …

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• In Ruby on Rails, how is view code able to use instance variables that are set inside the controller

  - by Jian Lin

  In Ruby on Rails, how is an ActionView object able to access the instance variables of ActionController object (how is view code able to use instance variables that are set inside the controller code)?

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• Can TextMate be changed to "shift text to right" by highlighting text and pressing Tab?

  - by Jian Lin

  Can TextMate be changed to "shift text to right" by highlighting text and pressing Tab? Right now it actually replace the whole selected text with a tab character but I almost never want to do something like that. I think some other editors like Notepad++ will indent to the next level.

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• In MVC framworks (such as Ruby on Rails), do usually Model spell as singular and controller and view

  - by Jian Lin

  I usually see Ruby on Rails books using script/generate model Story name:string link:string which is a singular Story, while when it is controller script/generate controller Stories index then the Story now is Stories, which is plural. Is this a standard on Ruby on Rails? Is it true in other MVC frameworks too, like CakePHP,…

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• why adding a simple div to HAML will break the code?

  - by Jian Lin

  it is quite strange that the following works: - 1.upto(30) do |i| = i %br but the following won't: %div this line - 1.upto(30) do |i| = i %br Isn't the second part just to add a div and let the numbers go into that div?

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• With database table design, Is there an advantage of using special naming convention for a Many-to-m

  - by Jian Lin

  Whenever there is a many-to-many relationship, I think there will be immediately a many-to-many table needed (also called a junction table). Is there any advantage of using special naming convention for these tables, as opposed to the other 1 to many tables? Or are there popular special naming conventions used by companies…

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• In SQL, a Join is actually an Intersection? And it is also a linkage or a "Sideway Union"?

  - by Jian Lin

  I always thought of a Join in SQL as some kind of linkage between two tables. For example, select e.name, d.name from employees e, departments d where employees.deptID = departments.deptID In this case, it is linking two tables, to show each employee with a department name instead of a department ID. And kind of…

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• In Ruby, why is a method invocation not able to be treated as a unit when "do" and "end" is used?

  - by Jian Lin

  The following question is related to the question "Ruby Print Inject Do Syntax". My question is, can we insist on using do and end and make it work with puts or p? This works: a = [1,2,3,4] b = a.inject do |sum, x| sum + x end puts b # prints out 10 so, is it correct to say, inject is an instance method of the…

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• In SQL, can we always write an inner join statement as a main query and subquery?

  - by Jian Lin

  In SQL, can we always write an inner join statement as a main query and subquery? For example, select * from gifts g where g.giftID in (select giftID from sentGifts); can do a join and show the gifts sent in the sentGifts table, but it won't be able to show the sentTime because that is inside the subquery?

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• In Ruby on Rails, the :id is only optional in routes.rb? How to tell optional vs not optional?

  - by Jian Lin

  In routes.rb map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format' but then http://localhost:3000/foobars/alt will work too. The params are: {"action"=>"alt", "controller"=>"foobars"} so looks like :id is optional here. How can you tell it is optional vs not optional?…

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• In Mercurial, what is the command to say "make all my files as of 2 months ago! (Revision 328)" or "

  - by Jian Lin

  In Mercurial, what is the command to say 1) make all my files as of two months ago (say, April 16, 6:03pm) (Revision 328 as seen from the hg log) 2) or, make my files back to the most current repository version?

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• In Ruby, how to write a method to display any object's instance variable names and its values

  - by Jian Lin

  Given any object in Ruby (on Rails), how can I write a method so that it will display that object's instance variable names and its values, like this: @x: 1 @y: 2 @link_to_point: #<Point:0x10031b298 @y=20, @x=38> I also want to be able to print <br> to the end of each instance variable's value so as to…

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• In SQL, why is "select *, count(*) from sentGifts group by whenSent;" ok, but when "*" and "count(*)

  - by Jian Lin

  In SQL, using the table: mysql> select * from sentGifts; +--------+------------+--------+------+---------------------+--------+ | sentID | whenSent | fromID | toID | trytryWhen | giftID | +--------+------------+--------+------+---------------------+--------+ | 1 | 2010-04-24 | 123 | 456 |…

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• Is there a way to use a Ruby loop inside of HAML's :javascript region?

  - by Jian Lin

  Inside of HAML, can we have a loop inside the :javascript region? This will work: - 10.upto(20) do |i| :javascript document.getElementById('aDiv').innerHTML += '#{i}'; and this will not: :javascript - 10.upto(20) do |i| document.getElementById('aDiv').innerHTML += '#{i}'; can the code above…

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• Using sass, how do you style "#div1 img, #div2 img { height: 80px }" ?

  - by Jian Lin

  Using .sass, how do you style #box1 img, #anotherbox img { height: 80px } ? Is using mixins the only way?

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• why assert_equal() in Ruby on Rails sometimes seem to compare by Identity and sometimes by value?

  - by Jian Lin

  it was very weird that yesterday, I was do an integration test in Rails and assert_equal array_of_obj1, array_of_obj2 # obj1 from db, obj2 created in test and it failed. The values shown inside the array and objects were identical. If I change the test to assert array_of_obj1 == array_of_obj2 Then…

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• If the "with" statement in Javascript creates a new scope, why does the following code not work as e

  - by Jian Lin

  If the "with" statement in Javascript creates a new scope, shouldn't clicking on the links show a different x which are in different scopes? It doesn't. <a href="#" id="link1">ha link 1</a> <a href="#" id="link2">ha link 2</a> <a href="#" id="link3">ha link 3</a> <a…

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• how big is the performance impact of using system('hostname') in PHP?

  - by Jian Lin

  I saw some existing code in the PHP scripts doing a system('hostname'); how big can the performance impact on the server be if using this method?

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• In Mercurial (hg), how do you see a list of files that will be pushed if an "hg push" is issued?

  - by Jian Lin

  We can see all the changesets and the files involved using hg outgoing -v but the filenames are all scattered in the list of changesets. Is there a way to just see a list of all the files that will go out if hg push is issued?

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• In Javascript, when is a new scope created? (with a new function and in a "with" statement) Are the

  - by Jian Lin

  In Javascript, when is a new scope created? The 2 situations I know of are: with a new function in a "with" statement as a note, any new block (in if-then-else, loops, or just beginning a block for no other reason) won't create a new scope. Is there a third situation where a new scope is created…

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