Ruby for Rails phần 5 pdf
Ruby for Rails phần 5 pdf
... and exceptions 2 25
8.4 Error handling and exceptions
Way back in chapter 1, we looked at how to test code for syntax errors:
$ ruby -cw filename.rb
Passing the
-cw
test means Ruby can run your ... use an
absolute path for a file.
This may happen if you create a class or module with a name that’s similar to
the name of a Ruby built-in class or module. For example, Ruby come...
Ruby for Rails phần 6 pdf
... huge roles in Ruby and Rails. Some of the founda-
tional Ruby libraries upon which Rails is built use hashes to pass data around; in
particular, the Ruby
CGI library makes your CGI form data available ... of
the irb session format for the code examples, and you can often try the examples
with small variations to get a feel for how Ruby behaves.
9.1 Ruby s literal constructors...
Ruby for Rails phần 8 pdf
... arity.
Ruby offers several variations on the callable method-or-function theme. We’ll
look next at another form of anonymous function: the lambda.
B
Part 4
Rails through Ruby,
Ruby through Rails
The ... you get more out of Rails by knowing more about Ruby. The
goals here are the goals of the book itself:
■
Learning the Ruby foundations of specific Rails techniques
■
Using y...
Ruby for Rails phần 1 pps
... 90
Ruby for Rails
RUBY TECHNIQUES FOR RAILS DEVELOPERS
DAVID A. BLACK
MANNING
Greenwich
(74° w. long.)
vii
PART ITHE RUBY/ RAILS LANDSCAPE 1
1 ■ How Ruby works 3
2
■ How Rails works 33
3
■ Ruby- informed ... views 422
17
■ Techniques for exploring the Rails source code 455
appendix
■ Ruby and Rails installation and resources 471
xii CONTENTS
5. 6 Inheritanc...
Ruby for Rails phần 2 ppsx
... extension (require it)
ruby -rprofile
version
Show Ruby version information
ruby version
A Rails application walk-through 45
Initializing the databases
To create the database for the application, ... in
Ruby and shipped with
Ruby) , lightTPD
CGI Library
CGI data processing
routines
Parses incoming
form data
Part of the Ruby
standard library
ERb
"Embedded Ruby& quot;
Tem...
Ruby for Rails phần 3 pps
... CHAPTER 3
Ruby- informed Rails development
because of Ruby (Ruby doesn’t care), but because leaving the parentheses off is a
standard Rails convention.
The common idioms you use in Rails aren’t ... come across something peculiar-looking, like this frequently
cited example:
puts 0 .5 - 0.4 - 0.1
-2.7 755 5 756 156 289e-17
The problem—or, more accurately, the inevitable consequenc...
Ruby for Rails phần 4 pptx
... do and looks better.
Ruby gives you some syntactic sugar for calling setter methods. Instead of this
ticket.price=( 65. 00)
you’re allowed to do this:
ticket.price = 65. 00
Format price to two
decimal ... inheritance bones.
5. 6.1 Inheritance and Rails engineering
Inheritance is one of the key organizational techniques for Rails program design
and the design of the Rails frame...
Ruby for Rails phần 7 doc
... started with: My phone number is (123) 55 5-1234.
The entire part of the string that matched: (123) 55 5-1234
The three captures:
Capture #1: 123
Capture #2: 55 5
Capture #3: 1234
Here's another ... "b", "y"]
Another common use case for
split
is performing a conversion from a flat, text-
based configuration file to a Ruby data format—array, hash, or somethin...
Ruby for Rails phần 9 pps
... the model
and its associated entities for a next level of information. This information, in
turn, might be used for in-house reports, richer on-screen information displays,
or sales profiling. ... cosmetic. The consistent
“Rubyness” of a Rails application makes for a consistent development experience:
It’s easier to think in Ruby the whole time than it is to switch back and forth. (...
Ruby for Rails phần 10 ppsx
... 234–2 35
cannot be redefined 237
colon (for symbol) 2 35
curly braces (for hashes) 2 35
ellipsis (for ranges) 2 35
for arrays ([]) 2 35, 279
for regular expressions
(//) 3 15
forward slashes (for regular ... modules
155 , 1 75
instantiating 158
nouns for names 159
querying for instance and/or
class methods 253
singleton 338
closures
analogous to packed
suitcase 353
d...
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