zhhz

1. Set the mysql bin path if you installed it by yourself in /usr/local/mysql
  #you have to set your mysql bin on your path:
  PATH=$PATH:/usr/local/mysql/bin 

2. Remove the default mysql executable files
  $ sudo mv /usr/bin/mysql_config usr/bin/mysql_config.old
  $ sudo mv /usr/bin/mysql usr/bin/mysql

zhhz

install do-mysql
Installing do_mysql-0.9.11
Building native extensions.  This could take a while...
ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb merb:gem:install
checking for mysql.h... no
checking for main() in -lmysqlclient... no
checking for mysql_query()... no
checking for mysql_ssl_set()... no

zhhz

# from dm-constraints/lib/dm-constraints/delete_constraint.rb
 when :destroy!
   if children
     # not sure why but this lazy_load is necessary
     # otherwise children will not be deleted with destroy!
     children.lazy_load
     children.destroy!
   end
....

zhhz

# from dm-constraints/lib/dm-constraints/delete_constraint.rb
 when :destroy!
   if children
     # not sure why but this lazy_load is necessary
     # otherwise children will not be deleted with destroy!
     children.lazy_load
     children.destroy!
   end
....

zhhz

#I am not sure if this is the feature(it is designed to do so), 
# or I'm doing it wrong. Here is the situation I have:
# as of DM version: 0.9.9

class Order
   before :destroy, :destroy_items
   ....
   has n, items ...
  
   def destroy_items

zhhz

# price_letter.pdf.erb
<%=
  require "prawn/measurement_extensions"
  require "prawn/table"

  pdf = Prawn::Document.new(
    :page_size => "A4", 
    :left_margin => 2.cm,
    :right_margin => 2.cm,
    :top_margin => 2.cm,

zhhz

pdf = Prawn::Document.new(
  :page_size => "A4", 
  :left_margin => 2.cm,
  :right_margin => 2.cm,
  :top_margin => 2.cm,
  :bottom_margin => 1.5.cm 
)
  # logo
logo = image_dir + 'logo.jpg'
pdf.image logo, :position => :center

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def priceletter
  provides :pdf

...
end

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<%= form_for(@price_letter, :action => resource(:ordering, @price_letter, :priceletter, :format => "pdf"), :class => "form") do %>

  # fields for ....

<% end =%>

zhhz

Merb::BootLoader.after_app_loads do
  Merb.add_mime_type(:pdf, :to_pdf, %w[application/pdf], "Content-Encoding" => "gzip")
end