Databases
StackOverflow2013
Postsdbo
POOverride a form field value in rails form
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POOverride a form field value in rails form
    primarykey
    data
    text
    <p><strong>Note:</strong> I was overthinking things when I originally asked this question. The accepted answer is correct for the examples I gave - i.e. you can just pass <code>:value</code> to text_field, however I'd actually been having problems with <code>date_select</code>, which doesn't have a facility to override the value set.</p> <p>As a result this has now been updated in Rails, so you can set <code>:selected =&gt; a_date</code>, and it will work as expected. This will be in Rails 4.</p> <hr> <p>I have a model that can inherit its value from a parent model. It works something like this:</p> <pre><code>class User &lt; ActiveRecord::Base attr_accessible :field_name belongs_to :company def field_name if self['field_name'].nil? company['field_name'] else self['field_name'] end end end class Company &lt; ActiveRecord::Base attr_accessible :field_name end </code></pre> <p>I then have a form to edit the User, but of course, if the User value is nil, then it populates the form with the value from Company, which is not what I want.</p> <p>I would like to be able to override the value of the form field, so that if the User value is nil, then the value is empty.</p> <p><strong>Attempt 1</strong></p> <p>Ideally I'd be able to do:</p> <pre><code>&lt;%= form_for @user do |f| %&gt; &lt;%= f.text_field :field_name, @user['field_name'] %&gt; &lt;% end %&gt; </code></pre> <p>But that doesn't work, there doesn't seem to be a mechanism for providing an override value.</p> <p><strong>Attempt 2</strong></p> <p>So I thought about creating a second getter/setter:</p> <pre><code>def field_name_uninherited self['field_name'] end def field_name_uninherited=(value) self['field_name']=value end </code></pre> <p>Now I can use <code>&lt;%= f.text_field :field_name_uninherited %&gt;</code> and it works as expected - great! <strong>Except:</strong> when <code>field_name</code> is a date, or other type using multiparameter attributes, it results in this error:</p> <pre><code>1 error(s) on assignment of multiparameter attributes </code></pre> <p>I believe this is because it doesn't know that this is a date field, as it infers this from the database, and this field (with _uninherited suffix) is not in the database.</p> <p><em>So I need some way to mark my additional method as the same type as the original database field.</em></p> <hr> <p>A further note, the above examples (using field_name) are a simplified version. I'm actually using <a href="https://github.com/colinbm/inherits_values_from" rel="nofollow">https://github.com/colinbm/inherits_values_from</a> to handle the inheritance, but I don't think this is important to the question.</p> <hr> <p>Obviously if there's a better way to accomplish the same goal, then I'm all ears.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USColin
    1. USColin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COI think digitalWestie's solution is the way to go here. But for Attempt 2 I wrote a gem ages ago which let you have 'typed' attributes that weren't database backed, and I have just found out that someone ported it to Rails 3 (https://github.com/daemon/virtual_attributes) could be worth a look.
      singulars
      1. POOverride a form field value in rails form
      1. USlatentflip
    2. COn.b. just spotted that it's 2 years old, so you might not want to _actually_ use it, but might be of interest anyway.
      singulars
      1. POOverride a form field value in rails form
      1. USlatentflip
    3. COAh yes, that does look like the way to go doing it that way, but if I can keep it simple then I shall! Stuck on making that work on date_selects at the moment though (which is why I thought value: didn't work in the first place.
      singulars
      1. POOverride a form field value in rails form
      1. USColin
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload