Notes posted by annaswims

flags

from ‘man recvfrom’

The flags argument to a recv() function is formed by or'ing one or more of the values:

MSG_OOB        process out-of-band data
MSG_PEEK       peek at incoming message
MSG_WAITALL    wait for full request or error

The MSG_OOB flag requests receipt of out-of-band data that would not be received in the normal data stream.  Some protocols place expedited data at the head of the
normal data queue, and thus this flag cannot be used with such protocols.  The MSG_PEEK flag causes the receive operation to return data from the beginning of the
receive queue without removing that data from the queue.  Thus, a subsequent receive call will return the same data.  The MSG_WAITALL flag requests that the opera-
tion block until the full request is satisfied.  However, the call may still return less data than requested if a signal is caught, an error or disconnect occurs, or
the next data to be received is of a different type than that returned.

Regenerate the JavaScript after each RJS call

RISCfuture - I had trouble using sortable_element_js in my rjs (javascript error when I used options), but had success with page.sortable(‘the_id’,{a_hash_of_my_options}) in my rjs

session expiration

If you need to set expiration period for sessions through all controllers in your application, simply add the following option to your config/intializers/session_store.rb file:

:expire_after => 60.minutes

If you need to set different expiration time in different controllers or actions, use the following code in action or some before_filter:

request.session_options = request.session_options.dup
request.session_options[:expire_after] = 5.minutes
request.session_options.freeze

Duplication of the hash is needed only because it is already frozen at that point, even though modification of at least :expire_after is possible and works flawlessly.

from - http://squarewheel.pl/posts/3

Format meaning:

%a - The abbreviated weekday name (“Sun”)

%A - The full weekday name (“Sunday”)

%b - The abbreviated month name (“Jan”)

%B - The full month name (“January”)

%c - The preferred local date and time representation

%d - Day of the month (01..31)

%H - Hour of the day, 24-hour clock (00..23)

%I - Hour of the day, 12-hour clock (01..12)

%j - Day of the year (001..366)

%m - Month of the year (01..12)

%M - Minute of the hour (00..59)

%p - Meridian indicator (“AM” or “PM”)

%S - Second of the minute (00..60)

%U - Week number of the current year, starting with the first Sunday as the first day of the first week (00..53)

%W - Week number of the current year, starting with the first Monday as the firstday of the first week (00..53)

%w - Day of the week (Sunday is 0, 0..6)

%x - Preferred representation for the date alone, no time

%X - Preferred representation for the time alone, no date

%y - Year without a century (00..99)

%Y - Year with century

%Z - Time zone name

%% - Literal “%” character

Format meaning

%a - The abbreviated weekday name (“Sun”)

%A - The full weekday name (“Sunday”)

%b - The abbreviated month name (“Jan”)

%B - The full month name (“January”)

%c - The preferred local date and time representation

%d - Day of the month (01..31)

%H - Hour of the day, 24-hour clock (00..23)

%I - Hour of the day, 12-hour clock (01..12)

%j - Day of the year (001..366)

%m - Month of the year (01..12)

%M - Minute of the hour (00..59)

%p - Meridian indicator (“AM” or “PM”)

%S - Second of the minute (00..60)

%U - Week number of the current year, starting with the first Sunday as the first day of the first week (00..53)

%W - Week number of the current year, starting with the first Monday as the firstday of the first week (00..53)

%w - Day of the week (Sunday is 0, 0..6)

%x - Preferred representation for the date alone, no time

%X - Preferred representation for the time alone, no date

%y - Year without a century (00..99)

%Y - Year with century

%Z - Time zone name

%% - Literal “%” character

Options

Available options are (none of these exists by default):

* :limit - Requests a maximum column length. This is number of characters for :string and :text columns and number of bytes for :binary and :integer columns.
* :default - The column‘s default value. Use nil for NULL.
* :null - Allows or disallows NULL values in the column. This option could have been named :null_allowed.
* :precision - Specifies the precision for a :decimal column.
* :scale - Specifies the scale for a :decimal column.

Inflector moved to ActiveSupport::Inflector

Inflector moved to ActiveSupport::Inflector

Nested Model Forms

For a good example of nested model forms check out the rails blog.

http://weblog.rubyonrails.org/2009/1/26/nested-model-forms

Post =form post, NOT the http POST method

Post =forum post, NOT the http POST method

Note: any “Post” on this page has nothing to do with http methods. When I just looked at the collection_select code I was thrown off.