# How to dynamically create a controller? **URL:** \ **Category:** Rails\ **Created:** [February 17, 2007, 11:21am UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891 "2007-02-17T11:21:30Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 11:21am UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/1 "2007-02-17T11:21:30Z")
I’m making a website for newspaper. While implemeting ARCHIVE function, I met a problem. I expect that “…/main/archive/volume\_number” is redirected to “…/volume\_number/index”. However, there are so many volumes in archives and I can’t make all controllers manually, each for one volume. So, in “main” controller, in “archive” method, I want to dynamically create a controller named volume\_number(probably specified by params[:id]) and redirect to the controller. Please help =) If you have another idea for implementing archives, please tell me. I’m using Mysql and articles are categorized by volume number. ---
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 3:45pm UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/2 "2007-02-17T15:45:34Z")
Are these archives in separate databases? I don’t see you needing to create separate controllers for each archive. You might have to juggle some table naming features but nothing terribly insane. [I do it for a multi-site app I’m working on where each site has their own content db.] Without knowing more about the particular constraints you’re under I can’t/won’t hazard any further speculation but I wouldn’t give up just yet. RSL ---
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 5:11pm UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/3 "2007-02-17T17:11:01Z")
Thank you for your attention. Archives are not in separate databases. All articles are in one database(named ‘entries’), and the database just has the attribute named ‘volume’. The main page shows the lastest volume, that is newest. When someone clicks the ‘archives’ button and choose the volume number, then screen changes and shows that volume in the same way as the lastest volume is shown.(I don’t mean that each volume has just one page. You can think one volume is one group of many pages.) Therefore, each volume must be distinguishable but must have the same structure on screen. Thanks. Russell N. wrote: > Are these archives in separate databases? I don’t see you needing to > create > separate controllers for each archive. You might have to juggle some > table > naming features but nothing terribly insane. [I do it for a multi-site app I’m working on where each site has their own content db.] Without > knowing > more about the particular constraints you’re under I can’t/won’t hazard > any > further speculation but I wouldn’t give up just yet. > > RSL ---
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 5:23pm UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/4 "2007-02-17T17:23:47Z")
As I see it you’re just wanting to index them by volume which is snaptastically easy. First you’ll need to make your routing aware of the the volume parameter. map.connect “/main/archive/:volume” will give you @volume [as a String, mind you] to use in your controller. In the controller just do something like Entry.find(:all, :conditions =\> [“volume = ?”, @volume]). You might need to change that @volume to @volume.to\_i but might not. This isn’t the whole solution [since 1) I don’t know the rest of your code and 2) you’re the one getting paid for it – hopefully] but should get you moving in the right direction. RSL ---
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 6:05pm UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/5 "2007-02-17T18:05:20Z")
Thank you very much. It’s a very great solution for me. Thanks =) Russell N. wrote: > As I see it you’re just wanting to index them by volume which is > snaptastically easy. First you’ll need to make your routing aware of the > the > volume parameter. map.connect “/main/archive/:volume” will give you > @volume > [as a String, mind you] to use in your controller. In the controller > just do > something like Entry.find(:all, :conditions =\> [“volume = ?”, @volume]). > You > might need to change that @volume to @volume.to\_i but might not. This > isn’t > the whole solution [since 1) I don’t know the rest of your code and 2) > you’re the one getting paid for it – hopefully] but should get you > moving > in the right direction. > > RSL ---
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 6:51pm UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/6 "2007-02-17T18:51:57Z")
Hi~ On Feb 17, 2007, at 8:23 AM, Russell N. wrote: > RSL Actually /main/archive/:volume will not give you @volume, it will give you params[:volume] -Ezra > then screen changes and shows that volume in the same way as the > > > Are these archives in separate databases? I don’t see you needing to > > any > > > – Ezra Z. – Lead Rails Evangelist – removed\_email\_address@domain.invalid – Engine Y., Serious Rails Hosting – (866) 518-YARD (9273) ---
**Author:** ![zukjimote](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/df705f/32.png) [@zukjimote](https://www.ruby-forum.com/u/zukjimote)\ **Post date:** [February 17, 2007, 8:24pm UTC](https://www.ruby-forum.com/t/how-to-dynamically-create-a-controller/85891/7 "2007-02-17T20:24:12Z")
D’oh! You’re right! Now I’m scratching my head trying to figure out why I wrote [and _thought_] that when I do know better. Perhaps some brainfart about the long-deprecated @params variable? Sure, let’s blame that. [Shame on me.] RSL