Hi everyone, I''m trying to make my first rails app which is a product
catalog. I have finished an administrative back-end and added data but
am currently having problems figuring out how to list the products in
the front end. Each product belongs to a section and type (ie: the
product "western shirt" would be in section "vintage" and
type
"shirts"). I also gave the product model a gender type which is
just
a hard coded inclusion list. The product to section/typ mode
relationship is belongs_to and :has many. I would like to show lists of
product "types" in a specific section for males and females, basically
like the folowing...
Section - Vintage
Male Types
Jackets -> Product 1, Product 2, Product 3
Jeans
Shirts
Female Types
Jackets
Jeans
Shirts
Currently, I''m able to show selected products in a section by gender
using the following in my store controller...
def show_section
@sections = Section.find(:all)
@section = Section.find_by_permalink(params[:id])
@products = Product.find(:first)
@male_products
@section.products.find_all_by_gender([''male'',''unisex''])
@female_products
@section.products.find_all_by_gender([''female'',''unisex''])
end
Can anyone point me in the right direction to get my view working in the
way I''ve described above? Any help would be greatly appreciated. I
have a bad feeling I may have been doing this all backwards.
--
Posted via http://www.ruby-forum.com/.
--~--~---------~--~----~------------~-------~--~----~
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?hl=en
-~----------~----~----~----~------~----~------~--~---
augustlilleaas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
2007-May-03 09:36 UTC
Re: association problems, :belongs_to and :has_many
Perhaps something like this works: http://pastie.caboo.se/58534 It''s pretty dirty though.. On May 3, 10:34 am, Raj Ojha <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> Hi everyone, I''m trying to make my first rails app which is a product > catalog. I have finished an administrative back-end and added data but > am currently having problems figuring out how to list the products in > the front end. Each product belongs to a section and type (ie: the > product "western shirt" would be in section "vintage" and type > "shirts"). I also gave the product model a gender type which is just > a hard coded inclusion list. The product to section/typ mode > relationship is belongs_to and :has many. I would like to show lists of > product "types" in a specific section for males and females, basically > like the folowing... > > Section - Vintage > > Male Types > > Jackets -> Product 1, Product 2, Product 3 > Jeans > Shirts > > Female Types > > Jackets > Jeans > Shirts > > Currently, I''m able to show selected products in a section by gender > using the following in my store controller... > > def show_section > @sections = Section.find(:all) > @section = Section.find_by_permalink(params[:id]) > @products = Product.find(:first) > @male_products > @section.products.find_all_by_gender([''male'',''unisex'']) > @female_products > @section.products.find_all_by_gender([''female'',''unisex'']) > end > > Can anyone point me in the right direction to get my view working in the > way I''ve described above? Any help would be greatly appreciated. I > have a bad feeling I may have been doing this all backwards. > > -- > Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
augustlilleaas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:> Perhaps something like this works: http://pastie.caboo.se/58534 > > It''s pretty dirty though..Hmm, I''ll have to look through this more in depth, it does seem sort of roundabout but thank you. Would a join table between the section and type models via a :has_many :through relationship work here? -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
Maybe this isn''t the most efficient method but I think I may be able to
do this by listing all the types like so..
in controller
@section = Section.find_by_permalink(params[:id])
@male_products =
@section.products.find_all_by_gender([''male'',''unisex''])
then in my view
<h3>Male</h3>
<ul>
<% for product in @male_products %>
<li><%=h(product.type.name)%></li>
<% end %>
</ul>
However this outputs duplicate types given that there are products in
@male_products with the same type. So I get something like this..
Male
Pants
Pants
Jackets
Jackets
Jackets
Shirts
Is there a way to only show each type once to avoid duplicates?
--
Posted via http://www.ruby-forum.com/.
--~--~---------~--~----~------------~-------~--~----~
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?hl=en
-~----------~----~----~----~------~----~------~--~---
On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > > Maybe this isn''t the most efficient method but I think I may be able to > do this by listing all the types like so.. > > in controller > > @section = Section.find_by_permalink(params[:id]) > @male_products > @section.products.find_all_by_gender([''male'',''unisex'']) > > then in my view > > <h3>Male</h3> > <ul> > <% for product in @male_products %> > <li><%=h(product.type.name)%></li> > <% end %> > </ul> > > However this outputs duplicate types given that there are products in > @male_products with the same type. So I get something like this.. > > Male > Pants > Pants > Jackets > Jackets > Jackets > Shirts > > Is there a way to only show each type once to avoid duplicates?Raj, In addition to anything else that you do, you may want to change the column name from "type" to something else. This may be effecting it since the type column has a special purpose in AR and shouldn''t be used except for STI. One option for removing the duplicates would be to specify a distintct call on the db. has_many :products, :select => "SELECT DISTINCT * FROM" Cheers Daniel --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
Daniel ----- wrote:> On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >> >> @male_products with the same type. So I get something like this.. >> >> Male >> Pants >> Pants >> Jackets >> Jackets >> Jackets >> Shirts >> >> Is there a way to only show each type once to avoid duplicates? > > > Raj, > > In addition to anything else that you do, you may want to change the > column > name from "type" to something else. This may be effecting it since the > type > column has a special purpose in AR and shouldn''t be used except for STI. > > One option for removing the duplicates would be to specify a distintct > call > on the db. > has_many :products, :select => "SELECT DISTINCT * FROM" > > Cheers > DanielThanks for the tip, I changed the typ attribute to kind instead, hopefully this is not a reserved word either. I also think I have a join table working between sections and kinds. However I am having the same problem with duplicate entries, can I use some select attribute for this too? -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > > Thanks for the tip, I changed the typ attribute to kind instead, > hopefully this is not a reserved word either. I also think I have a > join table working between sections and kinds. However I am having the > same problem with duplicate entries, can I use some select attribute for > this too?Raj, I''m having a little trouble trying to visualise your data structure. Do you think you could post the minimal relevant class declerations with the associtation declerations included. Cheers --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
Daniel ----- wrote:> On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: >> >> >> Thanks for the tip, I changed the typ attribute to kind instead, >> hopefully this is not a reserved word either. I also think I have a >> join table working between sections and kinds. However I am having the >> same problem with duplicate entries, can I use some select attribute for >> this too? > > > Raj, > > I''m having a little trouble trying to visualise your data structure. > Do > you think you could post the minimal relevant class declerations with > the > associtation declerations included. > > Cheerssorry for my lack of articulation, here are my classes class Product < ActiveRecord::Base set_table_name "products" set_primary_key "id" validates_presence_of :name validates_uniqueness_of :name validates_length_of :name, :minimum => 4 validates_inclusion_of :gender, :in => [''Male'', ''Female'', ''Unisex''], :message => "please pick a gender" validates_presence_of :gender validates_presence_of :section_id belongs_to :section, :class_name => "Section", :foreign_key => "section_id" belongs_to :kind, :class_name => "Kind", :foreign_key => "kind_id" end class Section < ActiveRecord::Base set_table_name "sections" set_primary_key "id" validates_presence_of :name validates_uniqueness_of :name validates_length_of :name, :minimum => 2 has_many :products, :class_name => "Product", :foreign_key => "section_id" has_and_belongs_to_many :kinds end class Kind < ActiveRecord::Base set_table_name "kinds" set_primary_key "id" validates_presence_of :name validates_uniqueness_of :name has_many :products, :class_name => "Product", :foreign_key => "kind_id" has_and_belongs_to_many :sections end my join table is named "kinds_sections" and it has "kind_id" and "section_id" columns (no index id) I''m using this bit of code to append the section and kind id''s to the join table when a new product is created or updated in my products controller. if @kind = Kind.find_by_id(params[:kind_id]) @product.kind = @kind @product.section.kinds << @product.kind end Maybe append is not the right modifier to use here? I probably need to have some check in there to see if that kind and section has already been added to the join_table. Plus, I''m not sure how to go about deletion of a product in relation to the join table, if a product is deleted and is the only product of that section and kind, then I would want to delete that row from the join table as well. I hope I''m making sense. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > > sorry for my lack of articulation, here are my classes > > class Product < ActiveRecord::Base > set_table_name "products" > set_primary_key "id" > > validates_presence_of :name > validates_uniqueness_of :name > validates_length_of :name, :minimum => 4 > > validates_inclusion_of :gender, :in => [''Male'', ''Female'', ''Unisex''], > :message => "please pick a gender" > validates_presence_of :gender > > validates_presence_of :section_id > > belongs_to :section, :class_name => "Section", :foreign_key => > "section_id" > belongs_to :kind, :class_name => "Kind", :foreign_key => "kind_id" > end > > class Section < ActiveRecord::Base > set_table_name "sections" > set_primary_key "id" > > validates_presence_of :name > validates_uniqueness_of :name > validates_length_of :name, :minimum => 2 > > has_many :products, :class_name => "Product", :foreign_key => > "section_id" > has_and_belongs_to_many :kinds > end > > class Kind < ActiveRecord::Base > set_table_name "kinds" > set_primary_key "id" > > validates_presence_of :name > validates_uniqueness_of :name > > has_many :products, :class_name => "Product", :foreign_key => > "kind_id" > has_and_belongs_to_many :sections > end > > my join table is named "kinds_sections" and it has "kind_id" and > "section_id" columns (no index id) > > I''m using this bit of code to append the section and kind id''s to the > join table when a new product is created or updated in my products > controller. > > if @kind = Kind.find_by_id(params[:kind_id]) > @product.kind = @kind > @product.section.kinds << @product.kind > end > > Maybe append is not the right modifier to use here? I probably need to > have some check in there to see if that kind and section has already > been added to the join_table. Plus, I''m not sure how to go about > deletion of a product in relation to the join table, if a product is > deleted and is the only product of that section and kind, then I would > want to delete that row from the join table as well. I hope I''m making > sense.Removing the duplicates in this instance should be as easy as changing the HABTM declerations in your kind and section models by setting the :uniq option to true. Any duplicates should then be ignored. class Kind < ActiveRecord::Base ... has_and_belongs_to_many :sections, :uniq => true end and class Section < ActiveRecord::Base ... has_and_belongs_to_many :kinds end Hopefully I''ve understood the issue there ;) Cheers --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
Sorry a bit hasty with the go button. You will need to add the :uniq => true option to both kind and section class HABTM''s On 5/4/07, Daniel N <has.sox-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > > > On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote: > > > > > > sorry for my lack of articulation, here are my classes > > > > class Product < ActiveRecord::Base > > set_table_name "products" > > set_primary_key "id" > > > > validates_presence_of :name > > validates_uniqueness_of :name > > validates_length_of :name, :minimum => 4 > > > > validates_inclusion_of :gender, :in => [''Male'', ''Female'', ''Unisex''], > > :message => "please pick a gender" > > validates_presence_of :gender > > > > validates_presence_of :section_id > > > > belongs_to :section, :class_name => "Section", :foreign_key => > > "section_id" > > belongs_to :kind, :class_name => "Kind", :foreign_key => "kind_id" > > end > > > > class Section < ActiveRecord::Base > > set_table_name "sections" > > set_primary_key "id" > > > > validates_presence_of :name > > validates_uniqueness_of :name > > validates_length_of :name, :minimum => 2 > > > > has_many :products, :class_name => "Product", :foreign_key => > > "section_id" > > has_and_belongs_to_many :kinds > > end > > > > class Kind < ActiveRecord::Base > > set_table_name "kinds" > > set_primary_key "id" > > > > validates_presence_of :name > > validates_uniqueness_of :name > > > > has_many :products, :class_name => "Product", :foreign_key => > > "kind_id" > > has_and_belongs_to_many :sections > > end > > > > my join table is named "kinds_sections" and it has "kind_id" and > > "section_id" columns (no index id) > > > > I''m using this bit of code to append the section and kind id''s to the > > join table when a new product is created or updated in my products > > controller. > > > > if @kind = Kind.find_by_id(params[:kind_id]) > > @product.kind = @kind > > @product.section.kinds << @product.kind > > end > > > > Maybe append is not the right modifier to use here? I probably need to > > have some check in there to see if that kind and section has already > > been added to the join_table. Plus, I''m not sure how to go about > > deletion of a product in relation to the join table, if a product is > > deleted and is the only product of that section and kind, then I would > > want to delete that row from the join table as well. I hope I''m making > > sense. > > > Removing the duplicates in this instance should be as easy as changing the > HABTM declerations in your kind and section models by setting the :uniq > option to true. Any duplicates should then be ignored. > > class Kind < ActiveRecord::Base > ... > has_and_belongs_to_many :sections, :uniq => true > end > > and > > class Section < ActiveRecord::Base > ... > has_and_belongs_to_many :kinds > end > > Hopefully I''ve understood the issue there ;) > Cheers >--~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
Daniel ----- wrote:> Sorry a bit hasty with the go button. > > You will need to add the :uniq => true option to both kind and section > class > HABTM''sThanks so much for your help, this looks like it could be a better solution than what I just came up with, however while I only want one kind per section, I do want kinds in multiple sections, meaning... the "kind" jackets should be allowed in sections "vintage" and "new" but "vintage" and "new" sections should only have one instance of jackets in each of them, does that make sense? I just want to avoid the following... section vintage associated kinds jackets jackets pants pants but maybe I''m misunderstanding how the ":uniq => true" attribute works. I used the following code to check if a kind already exists in a section when creating or updating a product. In the product controller update and create actions I added... if @kind = Kind.find_by_id(params[:kind_id]) @product.kind = @kind unless @product.section.kinds.find_by_id(params[:kind_id]) == @product.kind @product.section.kinds << @product.kind end end I''m still confused about how to delete it from the join table, if I delete a jacket product from a section and it is the only jacket in that section, than I would want to remove that entry from the "section" "kinds" join_table, otherwise it should stay. Thank you again for all your help daniel. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---
On 5/4/07, Raj Ojha <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > > Daniel ----- wrote: > > Sorry a bit hasty with the go button. > > > > You will need to add the :uniq => true option to both kind and section > > class > > HABTM''s > > Thanks so much for your help, this looks like it could be a better > solution than what I just came up with, however while I only want one > kind per section, I do want kinds in multiple sections, meaning... > > the "kind" jackets should be allowed in sections "vintage" and "new" but > "vintage" and "new" sections should only have one instance of jackets in > each of them, does that make sense? I just want to avoid the > following... > > section vintage > > associated kinds > jackets > jackets > pants > pants > > but maybe I''m misunderstanding how the ":uniq => true" attribute works. > > I used the following code to check if a kind already exists in a section > when creating or updating a product. In the product controller update > and create actions I added... > > if @kind = Kind.find_by_id(params[:kind_id]) > @product.kind = @kind > unless @product.section.kinds.find_by_id(params[:kind_id]) => @product.kind > @product.section.kinds << @product.kind > end > end >I''m still confused about how to delete it from the join table, if I> delete a jacket product from a section and it is the only jacket in that > section, than I would want to remove that entry from the "section" > "kinds" join_table, otherwise it should stay. > > Thank you again for all your help daniel.I''m sorry my head might be packed with cotton this morning, but I''m really not understanding what your trying to do. It seems that the joining logic your trying to put into these controllers should exist in the models since they are related to your data integrity. You would probably be better off using has_many :through instead of HABTM because you can put your join logic into these fully blown rich join models. Adding joining logic to habtm is messy because you need to put it all over the place. By including it into the join model it keeps all the joining logic dry. You can also use the :uniq try option where you need it to. Hope that helps Daniel --~--~---------~--~----~------------~-------~--~----~ 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?hl=en -~----------~----~----~----~------~----~------~--~---