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Rails model columns and performance


Rails model columns and performance

By : user2952891
Date : November 19 2020, 03:59 PM
This might help you Avoiding a join will be better than having two tables.
You can limit which columns are returned by using select in ActiveRecord. If you have large text fields, but don't need them at a particular time, this can be helpful in improving performance. The impact is probably negligible with boolean columns.
code :


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Rails 3 model mapping certain columns to different model attributes

Rails 3 model mapping certain columns to different model attributes


By : user2760289
Date : March 29 2020, 07:55 AM
around this issue I have the old legacy table called "DXFTACCTS", and I created Rails model "Account". , You can use the method alias_attribute like this:
code :
class Account < ActiveRecord::Base
  set_table_name "DXFTACCTS"

  alias_attribute :first_name, :XORFNAME
end
Account.all(:conditions => { :first_name => "Foo" })
Rails model versioning - one model with independently versioned columns

Rails model versioning - one model with independently versioned columns


By : user3228641
Date : March 29 2020, 07:55 AM
like below fixes the issue Although I'd personally extract translations into their own model to avoid this, you should still be able to achieve this without too much trickery.
PaperTrail creates a new Version object every time a record is changed. Every version is accessible through the object.versions array.
code :
# Arguments:
#   attr - Must respond to to_s with name of attribute to revert
#   ver  - Integer (e.g. -1 for previous version) or actual Version object
def revert_attribute(attr, ver)
  ver = self.versions[ver] if ver.class == Integer
  ver = ver.reify
  self.write_attribute( attr, ver.read_attribute(attr) )
  self.save
end
In Rails, how to reference a model to another model through multiple columns?

In Rails, how to reference a model to another model through multiple columns?


By : Michael Kolowicz
Date : March 29 2020, 07:55 AM
I hope this helps you . You cannot have composite primary keys in rails out of the box. Fot that I think you will have to use gems. I would advise you to find a workaround.
However to have a starting point, look here:
Which columns should I index in this Post model in order to improve performance (Rails)?

Which columns should I index in this Post model in order to improve performance (Rails)?


By : Jamingo
Date : March 29 2020, 07:55 AM
I hope this helps . You should worry about indexing columns when you know that you are going to be doing SQL lookups on that column often. Without seeing the rest of your application code, it's hard to determine which columns you should index, but I'd say that you've chosen two good ones.
Below is a good post that helped me understand about indexes, it's got some old Rails syntax in there, but what's relevant are the points it makes about when to index a column.
Ruby on Rails Model with calendar bar as columns and Primary Key from different model as rows?

Ruby on Rails Model with calendar bar as columns and Primary Key from different model as rows?


By : Pan Deng
Date : March 29 2020, 07:55 AM
hope this fix your issue The timesheet is not part of the model you are trying to reach, but just an interface for some data and its relations. I would create a model "WorkRecord" where you can save desired information, like: WorkRecord(user_id, order_id, date, text, hours). So the new model would have to declare that it belongs_to user and belongs_to order, and also you should update user and order models with has_many workrecords. Not sure if the text part should be a fixed text, in which case it shoud also may be linked to another model (inexistent for now).
The migration has to be something like this:
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