[LRUG] Multi page form design gem for Rails?

Wed Feb 14 04:44:25 PST 2018

To clarify my poor explanation: the fact that we used the session as an answer store is incidental - it was just the quickest thing which worked. It would be trivial to change the answer store class to save to some other store (eg redis) and just store a key in the session.

Duncan Stuart

On Wed, 14 Feb 2018 at 12:25 Rob Anderson < Rob Anderson ( Rob Anderson <rob.anderson at paymentcardsolutions.co.uk> ) > wrote:

> 
> I feel it's best to avoid the session for this sort of thing if possible.
> 
> 
> We use a form object to mediate between the params and the Rails model
> itself.  The form object is responsible for performing the partial
> validation at each step of the form process.  The Rails model validates
> the whole thing when the data is complete.  The form object can delegate
> individual field validation tasks to the Rails model to keep DRY, as
> necessary.
> 
> 
> State is handled by rendering the previous step's form fields as hidden
> fields in step 2.  So all state is held by the browser.  This can mean
> that a multi-step form is implemented in a single Rails view + action,
> although it doesn't have to be.
> 
> 
> Rob
> 
> 
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> 
> On 14 February 2018 at 12:12, Duncan Stuart < dgmstuart at gmail.com > wrote:
> 
> 
>> 
>> I don’t know of a gem - it’s a recurring problem, and a fiddly one since
>> the concept of state is different from standard Rails CRUD. 
>> 
>> 
>> We’ve used an approach of storing a hash of answers in the session: https://github.com/
>> LBHackney-IT/maintain-my-home/ blob/develop/app/models/ selected_answer_store.rb
>> (
>> https://github.com/LBHackney-IT/maintain-my-home/blob/develop/app/models/selected_answer_store.rb
>> ) , and elsewhere configuring the branching structure of a set of similar
>> multiple-choice questions in YAML: https://github.com/ LBHackney-IT/maintain-my-home/
>> blob/develop/app/models/ question_set.rb (
>> https://github.com/LBHackney-IT/maintain-my-home/blob/develop/app/models/question_set.rb
>> )
>> 
>> 
>> This approach was borrowed from some gov.uk ( http://gov.uk ) site (I
>> forget which but you can find it in the commit history). Iirc that project
>> additionaly had an object responsible for deciding what the next question
>> should be, based on the previous answers. 
>> 
>> 
>> Good luck!
>> 
>> 
>> Duncan Stuart
>> 
>> On Wed, 14 Feb 2018 at 09:17 Stuart Harrison < Stuart Harrison (
>> Stuart+Harrison+%3Cpezholio at gmail.com%3E ) > wrote:
>> 
>> 
>>> Hey LRUG
>>> 
>>> 
>>> I’m about to embark on a project which has a couple of multi page branched
>>> forms, and, as it’s a common problem, I’m wondering if something exists
>>> that allows me to design a form either via a DSL or YAML, rather than
>>> having to reinvent the wheel each time. I used Surveyor (
>>> https://github.com/NUBIC/surveyor ) a few years ago, which kinda worked
>>> for me, but it did cause some pretty major headaches too, and now seems to
>>> be largely abandoned. I like the look of Wicked (
>>> https://github.com/schneems/wicked ) , which gets me part of the way there,
>>> but I don’t get that DSL-y way of designing the form and not having to
>>> worry about building the individual form parts in a view. Is there
>>> anything out there that supports this? Or are there any patterns that
>>> anyone else uses that would help this?
>>> 
>>> 
>>> Hope this makes sense
>>> 
>>> 
>>> Cheers
>>> 
>>> 
>>> Stu
>>> 
>>> 
>>> 
>> 
>> 
>> 
>> 
> 
> 
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