let(:user) { mock_model(User) }
works
it “should mock a user” do
@user = mock_model(User)
end
works
before(:all) do
@user = mock_model(user)
end
fails
before(:each) block { a=mock(User)
works
Mocks are implicitly verified and cleared out after(:each) so they won’t work in before(:all).
mock doesnot work in an example group (describe() block), but it works in an example (it() block).
def name=(name)
write_attribute(:name, name.capitalize)
end
def name
read_attribute(:name).downcase # No test for nil?
end
Image what will happen if you don’t use read_attribute or write_attribute
def name
name.upcase
end
=!= booom, infinite loops, think it about why
idiomatic adj. [idi] didaode, fuheyuyanxiguan de
Psudo code:
FasterCSV.parse(file, parse_options) do |row|
// hanle header
if header
row.push(“new col”)
next
end
// handle the column value of the “new column”
row.push(“column_value”)
end
push(*args)
A shortcut for appending multiple fields. Equivalent to:
args.each { |arg| faster_csv_row << arg }
This method returns the row for chaining.
[Source]
# File lib/faster_csv.rb, line 253
def push(*args)
args.each { |arg| self << arg }
self # for chaining
end
C:\> copy con lala.txt
a
file
with
many
lines
^Z
C:\> irb
irb(main):001:0> text = File.open('lala.txt').read
=> "a\nfile\nwith\nmany\nlines\n"
irb(main):002:0> bin = File.open('lala.txt', 'rb').read
=> "a\r\nfile\r\nwith\r\nmany\r\nlines\r\n"
" hello ".strip #=> "hello"
"\tgoodbye\r\n".strip #=> "goodbye"
remove leading and trailing whitespace
\r carriage return
\n field line
MY_CONSTANT = “abcdeeeedfjeouwpuo”
too long to compare to check if a string equal to MY_CONSTANT
Use symbol:
MY_CONSTANT = :string
symbol having an object identifier; that’s the reason of a O(1) comparison between symbols
symbol is just something fixed, not a string. When you need to use it, use :sym, not “sym”.
user input something simple to write
attributes in db use some complicated name to easy understand
several ways to solve this translation between user input and db objects
1) interpret user input to db objects at the level of user input leavel, maybe a name mapping?
2) update the attributes in the rails model
def attribute=(val)
pp = case val.ucase
when ‘F’ then ‘female’
when ‘M’ then ‘male’
else val
end
write_attribute(:attribute, pp)
end
render(:partial => article, : object => @new_article)
1) the :partial value does not have a prefix underscore; even the file name does
:partial => shared/header
look for app/views/shared/_header.html.erb
2) the value of : object is @new_article, and this value is assgined to the local variable in the partial with the same name as the template, which, here, is article;
so you can use article.title in the partial temple, which has the same value as @new_article.title
