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Show virtual field in rails view


Show virtual field in rails view

By : Mantis
Date : November 22 2020, 10:40 AM
I wish this helpful for you The complex structure was replaced by a database view.
More details of how to do this can be found at this tutorial (http://pivotallabs.com/database-views-performance-rails/) and in one of my other SO questions here (Connecting database view with polymorphic model in rails).
code :


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rails how to mapping a virtual view to a model

rails how to mapping a virtual view to a model


By : Luke Miller
Date : March 29 2020, 07:55 AM
it fixes the issue There are multiple ways to fulfill your requirement:
In your CashOrderStatus model, you can set table name to override default ORM mapping:
code :
class CashOrderStatus > ActiveRecord::Base
  set_table_name "order_statuses"

  belongs_to:cash_order
end
class CashOrderStatus > OrderStatus
  set_table_name "order_statuses"

  belongs_to:cash_order
end
Rails 3 validates_uniquess_of virtual field with scope

Rails 3 validates_uniquess_of virtual field with scope


By : Olivier
Date : March 29 2020, 07:55 AM
I wish this helpful for you I don't think you can do something like that with standard validates. Reason is, it usually is a "simple" sql look-up for uniqueness. But to check uniqueness of what's sent back from your method, it'd have to :
Get all entries of your scope For each, execute the fullname method. Add every result in an array while testing for uniqueness
code :
before_save :check_full_name_uniqueness

def check_full_name_uniqueness
  query_id = id || 0
  return !Patient.where("first_name = ? and last_name = ? and dob = ? and id != ?", first_name, last_name, dob, query_id).exists?
end
errors.add(:fullname, 'Your error')
your_object.errors.each do |k, v| #k is the key of the hash, here fullname, and v the error message
  #Do whatever you have to do
end
backbone handling rails virtual field

backbone handling rails virtual field


By : B. Hamm
Date : March 29 2020, 07:55 AM
this one helps. I added a method in my model that calculates the current progress. I also overrode the as_json method to include the virtual field in my response. , It was nested so I had to do this
code :
params[:assignment].delete('progress')
attr_reader :progress
Web2Py view can't see Lazy Virtual Field

Web2Py view can't see Lazy Virtual Field


By : user2347902
Date : March 29 2020, 07:55 AM
To fix this issue You have to use row.tablename.fieldname syntax in your virtual/lazy field definitions. Also, it is best to include the name in the declaration:
code :
scan_db.Shows.src = Field.Lazy('src',
    lambda row, alt=None : URL('download', args=row.Shows.Logo if alt==None else alt))
Metaprogramming or other better way to handle virtual view fields in Rails 4

Metaprogramming or other better way to handle virtual view fields in Rails 4


By : carton qaem
Date : March 29 2020, 07:55 AM
may help you . It appears to me that each of the virtual fields will have a custom label. Why not create an array of names and labels:
code :
@virtual_fields = [{field:'field_1',label:'Field Number One'},{field:'field_2',label:'Field Number Two'},{field:'field_3',label:'Field Number Three'}]
<%virtual_fields.each do |vf|%>
  <div class="col-md-3">
    <%= f.input @model_with_vf.send(vf[:field]), :as => :boolean, label: vf[:label], :input_html => { checked: false } %>
  </div>
<%end%>
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