Google is seriously failing me right now. All I need to do is update one attribute, setting a user to admin, from the Heroku rails console.
I can't find a single simple answer. What I've been trying is:
Record.update_attribute(:roles_mask, "1")
Where record is the correct record.
'undefined method 'update attribute''
I can't just type Record.roles_mask = 1?
EDIT.
I used Record, and I shouldn't have done that in the example. What I've done is exactly this:
ian = User.where(:id => '5')
ian.update_attribute(:roles_mask, '1')
Error: undefined method 'update_attributes'
The problem is that using the .where function creates a relation, rather than finding the record itself. Do this:
ian = User.find(5)
ian.update_attribute(:roles_mask, '1')
Or if you want to use .where then you could do this:
ian = User.where(:id => 5)
ian.first.update_attribute(:roles_mask, '1')
EDIT
See this answer for details about why this is happening.
To use update_attribute (or update_attributes), you need to call that from an instance and not the class.
rails c> rec = Record.find(1)
rails c> rec.update_attribute(:att, 'value')
rails c> rec.update_attributes(att: 'value', att2: 'value2')
I would think that should take care of your issue.
Where clause return a array and you are trying to make update query on array, that's why you got error.
you should try to find out first record
ian = User.where(:id => 1).first
or
ian = User.find(1)
or
ian = User.find_by_id(1)
now your update query will work.
ian.update_attribute(:roles_mask, '1')
Related
This is a custom rake task file, if that makes a difference.
I want to pull all user_id's from Pupil, and apply them to get the User.id for all pupils.
It happily prints out line 2 with correct user_id, but then considers user_id a 'method' and breaks on line 3. Why? Where is my mistake?
course_pupils = Pupil.where(course_id: study.course_id)
course_pupils.map { |a| puts a.user_id }
pupils = User.where(id: course_pupils.user_id )
course_pupils is still a relation when you are calling it in line 3. Line 2 is non destructive (and if it was, it would turn it into an array of nils because puts returns nil).
You need to do:
pupils = User.where(id: course_pupils.pluck(:user_id) )
Or something like that
You are doing it wrong, you cannot call an instance method user_id on a collection, try this instead
user_ids = Pupil.where(course_id: study.course_id).pluck(:user_id)
pupils = User.where(id: user_ids )
Hope that helps!
In rails 4.2.4, I can successfully execute this line of code.
Model.Create!(name: "Bob")
In Rails 4.2.5, this does nothing and leaves me with a null field in the database. To get past this, I must do something like this...
s = Model.Create!()
s.name = "Bob"
s.save!
Does anyone know why the first method doesn't work? Has rails been updated to something different? I haven't been able to find a solution for this. Thanks in advance.
Difference Between Model.create() and Model.new()
Model.create() It will create and save empty columns DB, if its not "validated".
Model.new() It will create empty table but not saves it in DB. Until will not be saved.
Example:
u = User.new
u.first_name = 'Joe'
u.last_name = 'Doe'
u.save #this saves DB.
Here is good Examples
Foo.where(:some_id => 1).update_all(:some_columnn => "1")
Is this the right way to update Foo? I don't want to do a find and update the object.
As of Rails 4, the conditions are no longer supplied on the update_all method, but are instead specified on the preceding collection. For example,
# updates everything, as usual
Foo.update_all(some_column: '1')
# update only the specified rows
Foo.where(some_id: 1).update_all(some_column: '1')
Yes it is the right way, but remember, no callbacks or validations will be executed.
BTW, update_all accepts conditions also. Like this
Foo.update_all({:some_columnn => "1"}, {:some_id => 1})
It is the right approach if you don't want to instantiate an object, but keep in mind that this also means it won't perform any of your models validations or callbacks - it goes straight to a SQL update command.
Further information
You can use conditions,according to the api of update_all
update_all(updates, conditions = nil, options = {})
So you can do:
Foo.update_all(:some_column => '1', :some_id => 1)
In SQL I would do this:
SELECT minimummonths WHERE name = "gold"
I want to do the same in Ruby on Rails and have the following in the new section of my orders controller:
#plan = params[:plan]
#Payplanrow = Payplan.where(:name => #plan).minimummonths
I then try to display #payplanrow in my page using <%=#Payplanrow %> but it doesnt work. I get the error:
undefined method `minimummonths' for #<ActiveRecord::Relation:0x007fe30f870ec0>
I want to print the minimummonths value for the plan selected. There will only ever be one row of data corresponding to the #plan value.
I'm pretty new to Ruby on Rails so I'm just trying to get a pointer in the right direction. I looked everywhere but there doesn't seem to be an example of this.
The problem is Payplan.where(:name => #plan) is returning an array of Payplan objects. Assuming you are using Rails 3, you can read more about it in "Active Record Query Interface".
But, if you are certain that your query is returning only one record you could do:
#Payplanrow = Payplan.where(:name => #plan).first.try(:minimummonths)
The Rails way is to have a scope in your model:
class Payplan < ActiveRecord::Base
scope :by_name, lambda {|name|
{:conditions => {:name => name}}
}
end
#controller
#Payplanrow = Payplan.by_name(#plan).first.try(:minimummonths)
Although it's not really optimal, you can do:
#Payplanrow = Payplan.where(:name => #plan).first.minimummonths
You can use pluck to get only the minimummonths value :
minimummonths = Payplan.where(:name => #plan).pluck(:minimummonths).first
Instead of using where then first, it's better to use find when you are expecting a single record.
#Payplanrow = Payplan.find_by_name(#plan).try(:minimummonths)
That should be:
Payplan.where(:name => #plan).first.minimummonths
I want to find records with multiple conditions and this is my code:
#calhappybd = Client.where(:user_id => current_user.id, "birth IS NOT NULL")
I'm trying to do this with squeel-gem, but when I try to use multiple conditions (where{(cond1)(cond2)}), but my current_user.id defined as simple string-data.
With squeel, you should be able to do something like
#calhappybd = Client.where{(user_id == current_user.id) & (birth != nil)}
Let know if you get the same error again...
UPDATED:
Modified the conditions above. Note the single ampersand and double equals. That works for me..
My configuration:
rails 3.1.0.rc6
squeel 0.8.8