Sorry if you''ve seen this before. I didn''t get a response
from the
original post. Because this is such a high volume list, posts < 1 day
old don''t tend to not get responses. ( or, maybe I''m just too
impatient :)
I''m trying to understand how the Rails scaffold generator works well
enough that I can teach it to write Markaby files. Most of the
templates were easy, but I''m having problems with the form templates.
1. The template/form.rhtml file refers to
<%= template_for_inclusion%>
I''m guessing that ''template_for'' is a method and
''inclusion'' is a
variable. Where does this variable come from? How can I tell where it
gets referenced/populated?
2. How do the '' <table><tbody> '' tags get
generated? I don''t see
them in any of the scaffold_generator files.
3. What does ''lamda(method_name)'' do? Is it saying:
''include the
output from method_name here'' ?
--
Best Regards,
-Larry
"Work, work, work...there is no satisfactory alternative."
--- E.Taft Benson
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Larry Kelly wrote:> I''m trying to understand how the Rails scaffold generator works well > enough that I can teach it to write Markaby files. Most of the > templates were easy, but I''m having problems with the form templates.I have not delved into the scaffold generator code before, but I think I can answer some of these questions.> 1. The template/form.rhtml file refers to > <%= template_for_inclusion%> > > I''m guessing that ''template_for'' is a method and ''inclusion'' is a > variable. Where does this variable come from? How can I tell where it > gets referenced/populated?No, ''template_for_inclusion'' is all one word, so it''s either a local variable or a method call. A search for ''template_for_inclusion'' suggests that it''s assigned in line 284 of rails_generator/commands.rb: options[:assigns][''template_for_inclusion''] render_template_part(template_options) That hash then gets turned into local variables in the template with these lines (272-274) in command.rb: vars = template_options[:assigns] || {} b = binding vars.each { |k,v| eval "#{k} = vars[:#{k}] || vars[''#{k}'']", b } and that''s where your local variable template_for_inclusion comes from.> 2. How do the '' <table><tbody> '' tags get generated? I don''t see > them in any of the scaffold_generator files.I can''t see any <table> or <tbody> tags in the form view. The only table I can find is in the list view, and that template is defined in view_list.rhtml.> 3. What does ''lamda(method_name)'' do? Is it saying: ''include the > output from method_name here'' ?No. I''m guessing you''re looking at this line in scaffold_generator.rb: :sandbox => lambda { create_sandbox } Calling "lambda {some_code}" creates a new Proc object. It sort of encapsulates that code along with the current context (i.e. the current local variables) and lets you call it later. So in this line (line 106) in commands.rb: part_binding = template_options[:sandbox].call.sandbox_binding effectively ''runs'' the "create_sandbox" code, but in the context that it was originally created back in scaffold_generator.rb. If you have Programming Ruby by Dave Thomas, pages 56 and 356 onwards have more about this. If you don''t have the book, go out and by it now -- you are digging into some pretty deep Ruby (and Rails!) here, and a pickaxe would help. Chris --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk -~----------~----~----~----~------~----~------~--~---
On 10/19/06, Chris Mear <chris-OIzkuoyqg0kAvxtiuMwx3w@public.gmane.org> wrote:> > Larry Kelly wrote: > > I''m trying to understand how the Rails scaffold generator works well > > enough that I can teach it to write Markaby files. Most of the > > templates were easy, but I''m having problems with the form templates. > > I have not delved into the scaffold generator code before, but I think > I can answer some of these questions. > > > 1. The template/form.rhtml file refers to > > <%= template_for_inclusion%> > > > > I''m guessing that ''template_for'' is a method and ''inclusion'' is a > > variable. Where does this variable come from? How can I tell where it > > gets referenced/populated? > > No, ''template_for_inclusion'' is all one word, so it''s either a local > variable or a method call. > > A search for ''template_for_inclusion'' suggests that it''s assigned in > line 284 of rails_generator/commands.rb: > > options[:assigns][''template_for_inclusion''] > render_template_part(template_options) > > That hash then gets turned into local variables in the template with > these lines (272-274) in command.rb: > > vars = template_options[:assigns] || {} > b = binding > vars.each { |k,v| eval "#{k} = vars[:#{k}] || vars[''#{k}'']", b } > > and that''s where your local variable template_for_inclusion comes from. > > > 2. How do the '' <table><tbody> '' tags get generated? I don''t see > > them in any of the scaffold_generator files. > > I can''t see any <table> or <tbody> tags in the form view. The only > table I can find is in the list view, and that template is defined in > view_list.rhtml. >I couldn''t find them either, I did see the table row tags. When the _form .rhtml file is generated, the form partial is magically wrapped in <table><tbody> tags.> > 3. What does ''lamda(method_name)'' do? Is it saying: ''include the > > output from method_name here'' ? > > No. I''m guessing you''re looking at this line in scaffold_generator.rb: > > :sandbox => lambda { create_sandbox } > > Calling "lambda {some_code}" creates a new Proc object. It sort of > encapsulates that code along with the current context (i.e. the current > local variables) and lets you call it later. So in this line (line 106) > in commands.rb: > > part_binding = template_options[:sandbox].call.sandbox_binding > > effectively ''runs'' the "create_sandbox" code, but in the context that > it was originally created back in scaffold_generator.rb. > > If you have Programming Ruby by Dave Thomas, pages 56 and 356 onwards > have more about this. > > If you don''t have the book, go out and by it now -- you are digging > into some pretty deep Ruby (and Rails!) here, and a pickaxe would help. >I have AWDwR 1 and 2.beta. I''ll look up that reference. I also am going through Ruby 4 Rails. Was just reading about Proc''s yesterday. I''ll reread it with what you said in mind. -Larry> Chris > > > > >-- Best Regards, -Larry "Work, work, work...there is no satisfactory alternative." --- E.Taft Benson --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk -~----------~----~----~----~------~----~------~--~---
Larry Kelly wrote:> On 10/19/06, Chris Mear <chris-OIzkuoyqg0kAvxtiuMwx3w@public.gmane.org> wrote: > > Larry Kelly wrote: > > > 2. How do the '' <table><tbody> '' tags get generated? I don''t see > > > them in any of the scaffold_generator files. > > > > I can''t see any <table> or <tbody> tags in the form view. The only > > table I can find is in the list view, and that template is defined in > > view_list.rhtml. > > > I couldn''t find them either, I did see the table row tags. When the > _form .rhtml file is generated, the form partial is magically wrapped > in <table><tbody> tags.Really? I can''t see anything like that in the scaffold I''ve just generated. It just has each field in a <p>. Chris --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk -~----------~----~----~----~------~----~------~--~---