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Richard

2006-Oct-15 01:37 UTC

Another sessions'' persistence problem

Hi All,

I started out hashes intended to be populated with status info, e.g.
sort_order, for several of my tables.  I started ApplicationController
with:

	session = {}
	tables = [:customers, :invoices, :payments]
	tables.each { |tbl| session[tbl] = {} }
	session[:tables] = tables

Question 1:  I had to include the initialization of session, for
otherwise the assignment in the third line fails.  But if Rails has a
built-in ''session'' hash-like element,  why is this assignment
necessary.

I checked that the above code worked by following it up with debugging
code:

		logger.debug "Application tables:"
		nTables = session[:tables].length
		(0..(nTables-1)).each { |i|
			symTbl = session[:tables][i]
			objElement = session[symTbl]
			logger.debug "\t" + symTbl.to_s + " => " +
objElement.inspect
		}

The log showed that the three empty hashes were indeed created.

I followed that up with a def show_session defined with a copy of the
debugging code. When this method was subsequently invoked  by some
other controller,  it crashed on the second line because
session[:tables] was nil ... because session isn''t persistent,  I
believe.

Any ideas on how to correct this situation?  I read the two recent
threads about sessions,  but they don''t seem to address my problem.

Thanks in Advance,
Richard


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Ezra Zygmuntowicz

2006-Oct-15 02:51 UTC

head link

Re: Another sessions'' persistence problem

Hi~

On Oct 14, 2006, at 6:37 PM, Richard wrote:
>
> Hi All,
>
> I started out hashes intended to be populated with status info, e.g.
> sort_order, for several of my tables.  I started ApplicationController
> with:
>
> 	session = {}
> 	tables = [:customers, :invoices, :payments]
> 	tables.each { |tbl| session[tbl] = {} }
> 	session[:tables] = tables
Is this inside of a method in your application controller? Or is it  
just right in the class def? If its not inside of a method then the  
session is not in scope. You shoudl do this with a before_filter and  
a method:

before_filter :setup_tables


def setup_tables
   tables = [:customers, :invoices, :payments]
   tables.each { |tbl| session[tbl] = {} }
   session[:tables] = tables
end

	Then it should work for you.

-Ezra

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Richard

2006-Oct-15 21:18 UTC

head link

Re: Another sessions'' persistence problem

Hi Ezra,

Your advice was a great boost forward.  But I still have a problem.

BTW, I''m running:
WinXP-Pro/SP2, MySQL 5.0.15-nt, Ruby 1.8.2-15, Rails  1.1.4
SciTE 1.59, FireFox 1.2.0.7, Java JDK 1.5.0_06

I used the before_filter :setup_tables, :show_session That allowed my
show_session to method to work both upon entry and exit from the
ApplicationController''s instantiation.

Show session also worked in app\controllers\MainController.rb#welcome

However, it failed in app\views\main\welcome.rhtml with the error:
ActionView::TemplateError (undefined local variable or method
`show_session''

So I think I need to move it''s def to someplace higher than both
controllers and views.  How can I do that? Or should I make it a global
function somehow?

If you don''t mind an additional question,  please give me your
assessment of a rescue clause I added to show_session,  as shown below.

Thanks for your outstanding advice.

Regards,
Richard

class ApplicationController < ActionController::Base
	before_filter :setup_tables, :show_session
	layout "base"

	logger.debug "==================================="
	logger.debug "Entering app\\controllers\\application.rb (top level)"
	logger.debug "==================================="

	def setup_tables
		tables = [:customers, :invoices, :payments]
		tables.each { |tbl| session[tbl] = {} }
		session[:tables] = tables
	end

	def show_session
		logger.debug "Application tables:"
		nTables = session[:tables].length
		(0..(nTables-1)).each { |i|
			symTbl = session[:tables][i]
			objElement = session[symTbl]
			logger.debug "\t" + symTbl.to_s  + " => " +
objElement.inspect
		}
	rescue
		raise "session[:tables] => nil" unless session[:tables]
		raise "nTables => #{nTables}" unless nTables != 3
		raise "symTbl => nil for session[:tables][#{i}]" unless symTbl
		raise "objElement => nil for session[#{symTbl}]" unless
objElement
	end

protected
	def sort_clause(model, column, *order)
        [snip]
	end

	logger.debug "^^^^^^^^^^^^^^^^^^^^^^^"
	logger.debug "Leaving app\\controllers\\application.rb (top level)"
	logger.debug "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv"
end





Ezra Zygmuntowicz wrote:> Hi~
>
> On Oct 14, 2006, at 6:37 PM, Richard wrote:
>
> >
> > Hi All,
> >
> > I started out hashes intended to be populated with status info, e.g.
> > sort_order, for several of my tables.  I started ApplicationController
> > with:
> >
> > 	session = {}
> > 	tables = [:customers, :invoices, :payments]
> > 	tables.each { |tbl| session[tbl] = {} }
> > 	session[:tables] = tables
>
> Is this inside of a method in your application controller? Or is it
> just right in the class def? If its not inside of a method then the
> session is not in scope. You shoudl do this with a before_filter and
> a method:
>
> before_filter :setup_tables
>
>
> def setup_tables
>    tables = [:customers, :invoices, :payments]
>    tables.each { |tbl| session[tbl] = {} }
>    session[:tables] = tables
> end
> 
> 	Then it should work for you.
> 
> -Ezra

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Ezra Zygmuntowicz

2006-Oct-15 21:30 UTC

head link

Re: Another sessions'' persistence problem

Hi~

On Oct 15, 2006, at 2:18 PM, Richard wrote:
>
> Hi Ezra,
>
> Your advice was a great boost forward.  But I still have a problem.
>
> BTW, I''m running:
> WinXP-Pro/SP2, MySQL 5.0.15-nt, Ruby 1.8.2-15, Rails  1.1.4
> SciTE 1.59, FireFox 1.2.0.7, Java JDK 1.5.0_06
>
> I used the before_filter :setup_tables, :show_session That allowed my
> show_session to method to work both upon entry and exit from the
> ApplicationController''s instantiation.
>
> Show session also worked in app\controllers\MainController.rb#welcome
>
> However, it failed in app\views\main\welcome.rhtml with the error:
> ActionView::TemplateError (undefined local variable or method
> `show_session''
>
> So I think I need to move it''s def to someplace higher than both
> controllers and views.  How can I do that? Or should I make it a  
> global
> function somehow?
>
> If you don''t mind an additional question,  please give me your
> assessment of a rescue clause I added to show_session,  as shown  
> below.
>
> Thanks for your outstanding advice.
>
> Regards,
> Richard
>
> class ApplicationController < ActionController::Base
> 	before_filter :setup_tables, :show_session
> 	layout "base"
>
> 	logger.debug "==================================="
> 	logger.debug "Entering app\\controllers\\application.rb (top
level)"
> 	logger.debug "==================================="
>
> 	def setup_tables
> 		tables = [:customers, :invoices, :payments]
> 		tables.each { |tbl| session[tbl] = {} }
> 		session[:tables] = tables
> 	end
>
> 	def show_session
> 		logger.debug "Application tables:"
> 		nTables = session[:tables].length
> 		(0..(nTables-1)).each { |i|
> 			symTbl = session[:tables][i]
> 			objElement = session[symTbl]
> 			logger.debug "\t" + symTbl.to_s  + " => " +
objElement.inspect
> 		}
> 	rescue
> 		raise "session[:tables] => nil" unless session[:tables]
> 		raise "nTables => #{nTables}" unless nTables != 3
> 		raise "symTbl => nil for session[:tables][#{i}]" unless
symTbl
> 		raise "objElement => nil for session[#{symTbl}]" unless
objElement
> 	end
>
> protected
> 	def sort_clause(model, column, *order)
>         [snip]
> 	end
>
> 	logger.debug "^^^^^^^^^^^^^^^^^^^^^^^"
> 	logger.debug "Leaving app\\controllers\\application.rb (top
level)"
> 	logger.debug "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv"
> end
>

	Lets rewrite some of this code to make it clearer.

class ApplicationController < ActionController::Base
	
   before_filter :setup_tables, :show_session
   layout "base"

   def setup_tables
     tables = [:customers, :invoices, :payments].map{ |tbl| session 
[tbl] = {}; tbl }
     session[:tables] = tables
   end
    <snip>
end


	SO I think you can leave out the show_session method. And when you  
want to see whats in the session in your view use this instead:

<%= debug(session) %>

	That will show you everything that is currently in the session in a  
nice yaml formatted view. If you really want to be able to call the  
show_session method from a view then you can do that by useing  
helper_method like this:


   helper_method :show_session

put that in your application.rb class right after the definition of  
show_session.



Cheers-

-- Ezra Zygmuntowicz 
-- Lead Rails Architect
-- ez-NLltGlunAUd/unjJdyJNww@public.gmane.org
-- Engine Yard, Serious Rails Hosting
-- Reliability, Ease of Use, Scalability
-- (866) 518-YARD (9273)



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Richard

2006-Oct-15 22:18 UTC

head link

Re: Another sessions'' persistence problem

Hi Ezra,

Thanks again for your excellent suggestions:
   <%= debug(session) %> and
   helper_method :show_session

They''re nice to know.  For the nonce, I want to stick with my
show_session because it focuses on the specific details I want from
session.  (OK, call me "stubborn".)

And the good news (for me, anyway) is that I solved the scope problem,
thanks to Rails For Ruby:  I moved the def to
app\helpers\application_helper.rb

(By the way,  I deleted my previous message because I was going to
substitute the essential part of this message.  Then I discovered your
reply.  This electronic correspondence is great!)

Again,  many thanks for taking the time to look at (and solve!) my
problem.

Best wishes,
Richard

Ezra Zygmuntowicz wrote:> Hi~
>
> On Oct 15, 2006, at 2:18 PM, Richard wrote:
>
> >
> > Hi Ezra,
> >
> > Your advice was a great boost forward.  But I still have a problem.
> >
> > BTW, I''m running:
> > WinXP-Pro/SP2, MySQL 5.0.15-nt, Ruby 1.8.2-15, Rails  1.1.4
> > SciTE 1.59, FireFox 1.2.0.7, Java JDK 1.5.0_06
> >
> > I used the before_filter :setup_tables, :show_session That allowed my
> > show_session to method to work both upon entry and exit from the
> > ApplicationController''s instantiation.
> >
> > Show session also worked in app\controllers\MainController.rb#welcome
> >
> > However, it failed in app\views\main\welcome.rhtml with the error:
> > ActionView::TemplateError (undefined local variable or method
> > `show_session''
> >
> > So I think I need to move it''s def to someplace higher than
both
> > controllers and views.  How can I do that? Or should I make it a
> > global
> > function somehow?
> >
> > If you don''t mind an additional question,  please give me
your
> > assessment of a rescue clause I added to show_session,  as shown
> > below.
> >
> > Thanks for your outstanding advice.
> >
> > Regards,
> > Richard
> >
> > class ApplicationController < ActionController::Base
> > 	before_filter :setup_tables, :show_session
> > 	layout "base"
> >
> > 	logger.debug "==================================="
> > 	logger.debug "Entering app\\controllers\\application.rb (top
level)"
> > 	logger.debug "==================================="
> >
> > 	def setup_tables
> > 		tables = [:customers, :invoices, :payments]
> > 		tables.each { |tbl| session[tbl] = {} }
> > 		session[:tables] = tables
> > 	end
> >
> > 	def show_session
> > 		logger.debug "Application tables:"
> > 		nTables = session[:tables].length
> > 		(0..(nTables-1)).each { |i|
> > 			symTbl = session[:tables][i]
> > 			objElement = session[symTbl]
> > 			logger.debug "\t" + symTbl.to_s  + " => " +
objElement.inspect
> > 		}
> > 	rescue
> > 		raise "session[:tables] => nil" unless session[:tables]
> > 		raise "nTables => #{nTables}" unless nTables != 3
> > 		raise "symTbl => nil for session[:tables][#{i}]" unless
symTbl
> > 		raise "objElement => nil for session[#{symTbl}]" unless
objElement
> > 	end
> >
> > protected
> > 	def sort_clause(model, column, *order)
> >         [snip]
> > 	end
> >
> > 	logger.debug "^^^^^^^^^^^^^^^^^^^^^^^"
> > 	logger.debug "Leaving app\\controllers\\application.rb (top
level)"
> > 	logger.debug "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv"
> > end
> >
>
>
> 	Lets rewrite some of this code to make it clearer.
>
> class ApplicationController < ActionController::Base
>
>    before_filter :setup_tables, :show_session
>    layout "base"
>
>    def setup_tables
>      tables = [:customers, :invoices, :payments].map{ |tbl| session
> [tbl] = {}; tbl }
>      session[:tables] = tables
>    end
>     <snip>
> end
>
>
> 	SO I think you can leave out the show_session method. And when you
> want to see whats in the session in your view use this instead:
>
> <%= debug(session) %>
>
> 	That will show you everything that is currently in the session in a
> nice yaml formatted view. If you really want to be able to call the
> show_session method from a view then you can do that by useing
> helper_method like this:
>
>
>    helper_method :show_session
>
> put that in your application.rb class right after the definition of
> show_session.
>
>
>
> Cheers-
>
> -- Ezra Zygmuntowicz
> -- Lead Rails Architect
> -- ez-NLltGlunAUd/unjJdyJNww@public.gmane.org
> -- Engine Yard, Serious Rails Hosting
> -- Reliability, Ease of Use, Scalability
> -- (866) 518-YARD (9273)

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Richard

2006-Oct-16 02:30 UTC

head link

Re: Another sessions'' persistence problem

This is just a test.


Richard wrote:> Hi Ezra,
>
> Thanks again for your excellent suggestions:
>    <%= debug(session) %> and
>    helper_method :show_session
>
> They''re nice to know.  For the nonce, I want to stick with my
> show_session because it focuses on the specific details I want from
> session.  (OK, call me "stubborn".)
>
> And the good news (for me, anyway) is that I solved the scope problem,
> thanks to Rails For Ruby:  I moved the def to
> app\helpers\application_helper.rb
>
> (By the way,  I deleted my previous message because I was going to
> substitute the essential part of this message.  Then I discovered your
> reply.  This electronic correspondence is great!)
>
> Again,  many thanks for taking the time to look at (and solve!) my
> problem.
>
> Best wishes,
> Richard
>
> Ezra Zygmuntowicz wrote:
> > Hi~
> >
> > On Oct 15, 2006, at 2:18 PM, Richard wrote:
> >
> > >
> > > Hi Ezra,
> > >
> > > Your advice was a great boost forward.  But I still have a
problem.
> > >
> > > BTW, I''m running:
> > > WinXP-Pro/SP2, MySQL 5.0.15-nt, Ruby 1.8.2-15, Rails  1.1.4
> > > SciTE 1.59, FireFox 1.2.0.7, Java JDK 1.5.0_06
> > >
> > > I used the before_filter :setup_tables, :show_session That
allowed my
> > > show_session to method to work both upon entry and exit from the
> > > ApplicationController''s instantiation.
> > >
> > > Show session also worked in
app\controllers\MainController.rb#welcome
> > >
> > > However, it failed in app\views\main\welcome.rhtml with the
error:
> > > ActionView::TemplateError (undefined local variable or method
> > > `show_session''
> > >
> > > So I think I need to move it''s def to someplace higher
than both
> > > controllers and views.  How can I do that? Or should I make it a
> > > global
> > > function somehow?
> > >
> > > If you don''t mind an additional question,  please give
me your
> > > assessment of a rescue clause I added to show_session,  as shown
> > > below.
> > >
> > > Thanks for your outstanding advice.
> > >
> > > Regards,
> > > Richard
> > >
> > > class ApplicationController < ActionController::Base
> > > 	before_filter :setup_tables, :show_session
> > > 	layout "base"
> > >
> > > 	logger.debug "==================================="
> > > 	logger.debug "Entering app\\controllers\\application.rb
(top level)"
> > > 	logger.debug "==================================="
> > >
> > > 	def setup_tables
> > > 		tables = [:customers, :invoices, :payments]
> > > 		tables.each { |tbl| session[tbl] = {} }
> > > 		session[:tables] = tables
> > > 	end
> > >
> > > 	def show_session
> > > 		logger.debug "Application tables:"
> > > 		nTables = session[:tables].length
> > > 		(0..(nTables-1)).each { |i|
> > > 			symTbl = session[:tables][i]
> > > 			objElement = session[symTbl]
> > > 			logger.debug "\t" + symTbl.to_s  + " =>
" + objElement.inspect
> > > 		}
> > > 	rescue
> > > 		raise "session[:tables] => nil" unless
session[:tables]
> > > 		raise "nTables => #{nTables}" unless nTables != 3
> > > 		raise "symTbl => nil for session[:tables][#{i}]"
unless symTbl
> > > 		raise "objElement => nil for session[#{symTbl}]"
unless objElement
> > > 	end
> > >
> > > protected
> > > 	def sort_clause(model, column, *order)
> > >         [snip]
> > > 	end
> > >
> > > 	logger.debug "^^^^^^^^^^^^^^^^^^^^^^^"
> > > 	logger.debug "Leaving app\\controllers\\application.rb (top
level)"
> > > 	logger.debug "vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv"
> > > end
> > >
> >
> >
> > 	Lets rewrite some of this code to make it clearer.
> >
> > class ApplicationController < ActionController::Base
> >
> >    before_filter :setup_tables, :show_session
> >    layout "base"
> >
> >    def setup_tables
> >      tables = [:customers, :invoices, :payments].map{ |tbl| session
> > [tbl] = {}; tbl }
> >      session[:tables] = tables
> >    end
> >     <snip>
> > end
> >
> >
> > 	SO I think you can leave out the show_session method. And when you
> > want to see whats in the session in your view use this instead:
> >
> > <%= debug(session) %>
> >
> > 	That will show you everything that is currently in the session in a
> > nice yaml formatted view. If you really want to be able to call the
> > show_session method from a view then you can do that by useing
> > helper_method like this:
> >
> >
> >    helper_method :show_session
> >
> > put that in your application.rb class right after the definition of
> > show_session.
> >
> >
> >
> > Cheers-
> >
> > -- Ezra Zygmuntowicz
> > -- Lead Rails Architect
> > -- ez-NLltGlunAUd/unjJdyJNww@public.gmane.org
> > -- Engine Yard, Serious Rails Hosting
> > -- Reliability, Ease of Use, Scalability
> > -- (866) 518-YARD (9273)

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Rails - Oct 2006 - Another sessions' persistence problem

Another sessions'' persistence problem

Re: Another sessions'' persistence problem

Re: Another sessions'' persistence problem

Re: Another sessions'' persistence problem

Re: Another sessions'' persistence problem

Re: Another sessions'' persistence problem