Hey folks trying to do a simple query where I find all records where a particular attribute is nil. In this case...
irb(main):009:0> Registration.where(:registration_cancellation_token != nil)
Registration Load (0.2ms) SELECT `registrations`.* FROM `registrations` WHERE (1)
=> [#<Registration id: 1, orientation_id: 13, first_name: "mark", last_name: "Busta", email: "marklocklear#gmail.com", student_id: "3232333", phone: "3884448333", registration_cancellation_token: nil, registration_cancelled_at: nil, checked_in: false, created_at: "2014-02-20 13:46:31", updated_at: "2014-02-20 13:46:31">]
...but the query is returning all registrations. Any help appreciated...
Registration.where("registration_cancellation_token IS NOT NULL")
Registration.where.not(registration_cancellation_token: nil)
This works for Rails 4
Related
I get this from an ActiveRecord call:
#<ActiveRecord::Associations::CollectionProxy [
#<CarService id: nil, car_id: nil, car_service: 1,
created_at: nil, updated_at: nil, car_type: 0>,
#<CarService id: nil, car_id: nil, car_service: 11,
created_at: nil, updated_at: nil, car_type: 1>]>
Once I get this, I need to filter only records where car_type = "0". How to do that without doing another database call (WHERE car_type = "0")?
Thank you in advance.
EDIT:
this:
car.car_services.select{|key, hash| hash['car_type'] == "1" }
does not work.
just convert your result to an array then filter it like this
result = car.car_services.to_a.select do |e|
e.car_type == "0"
end
You can use scope in CarService model:
scope :type_ones, -> { where(car_type: 1) }
and you can use it like this:
car.car_services.type_ones
If you use enum, it will be better. Because the enum creates to scopes automatically instead of you. And of course it has more features. More about the enum.
am having issues in running queries on data which i have been provided,
if i do Camera.first get the results as
#<Camera id: 6, created_at: "2013-12-12 17:30:32", updated_at: "2015-11-19 10:19:33", exid: "dublin-rememberance-floor2", owner_id: 4, is_public: true, config: {"snapshots"=>{"jpg"=>"/onvif/snapshot"}, "external_http_port"=>8105, "external_host"=>"89.101.225.158", "auth"=>{"basic"=>{"username"=>"admin", "password"=>"mehcam"}}}, name: "My Camera", last_polled_at: "2015-11-27 15:01:51", is_online: false, timezone: nil, last_online_at: "2014-05-01 09:45:39", location: "0101000020E6100000875341A08E0A19C0D6BB896BC6AC4A40", mac_address: nil, model_id: 6, discoverable: false, preview: nil, thumbnail_url: nil>
I am totally unaware about how to get the query run CONFIG object.
example: I want to select all the Cameras list which have same
"external_http_port"=>8105, "external_host"=>"89.101.225.158"
but they are in Config Object.
You can write query like following for json data fetch:
Camere.where("config->> 'external_http_port' = ? and config->> 'external_host' = ?", 8105, '9.101.225.158')
I'm playing on rails console and did the following steps:
agendamento = Agendamento.last
And got a record that looks like this
#<Agendamento id: 4, sala_id: 2, name: "Delta C", start_at: "2013-10-11 02:00:00", end_at: "2013-10-10 04:00:00", bookingDate: "2013-10-10",
bookingTime: "2000-01-01 23:00:00", bookingDuration: 2, approved: true, usuario_id: nil, created_at: "2013-10-05 02:24:00", updated_at: "2013-
10-05 02:24:00">
when I do agendamento.name I receive:
Delta C
and it works in all values, but not on sala_id, agendamento.sala_id returns
nil
This attribute is acessible in the model, why it is returning nil ?
Environment: Ruby 2 and Rails 4
If sala_id is a foreign key reference, have you tried invoking sala instead? That should give you the related object.
I've fixed this for my actual app fairly trivially by overriding the == operator, but it is driving me nuts and I haven't been able to find an explanation. As far as I know, ActiveRecord is supposed to determine the equality of two existing records just via the id field, right?
Apparently, no!
Loading development environment (Rails 3.0.4)
irb(main):001:0> c = ChallengeClaim.find(1)
=> #<ChallengeClaim id: 1, collection_id: 954, creation_id: nil, creation_type: nil, request_signup_id: 2, request_prompt_id: 5, claiming_user_id: 8, sent_at: nil, fulfilled_at: nil, defaulted_at: nil, created_at: "2011-09-23 04:39:07", updated_at: "2011-09-23 04:39:07">
irb(main):002:0> c2 = ChallengeClaim.find(2)
=> #<ChallengeClaim id: 2, collection_id: 954, creation_id: nil, creation_type: nil, request_signup_id: 2, request_prompt_id: 4, claiming_user_id: 8, sent_at: nil, fulfilled_at: nil, defaulted_at: nil, created_at: "2011-11-07 17:47:33", updated_at: "2011-11-07 17:47:33">
irb(main):003:0> c == c2
=> true
?!?!!??!
Any explanations gratefully welcomed so I can sleep at night again. :>
As Chris Heald pointed out above in the comments, indeed the comparison operator <=> was defined on ChallengeClaim!
There is function of attributes_name in Active record by which I can check the keys of an object but I can check the blank keys for of an object which is of MongoID not of ActiveRecord,
When I try this I got the following response
ruby-1.9.2-p290 :001 > u = User.new
=> #<User _id: 4e684f7771393161cc000001, _type: nil, username: nil, first_name: nil, last_name: nil, email: nil, password: nil, password_salt: nil, password_hash: nil, profile_picture: nil, facebook_id: nil, facebook_enabled: nil, facebook_access_token: nil, twitter_id: nil, twitter_enabled: nil, twitter_access_token: nil, twitter_access_secret: nil, points: nil, remember_token: nil, remember_token_expires_at: nil, active: false, activation_code: nil, activated_at: nil>
ruby-1.9.2-p290 :002 > u.attributes.keys
=> ["active", "_id"]
It only show the attributes which are not nill , How can I check all the attributes even which are nil ?
I actually wanted to make function which needs to use user.attributes.keys.include?('name')
Probably you want fields. Attributes is more or less related to what you got from db, fields is what you defined in your model. Following works for me:
User.fields.keys
User.first.fields.keys
User.attributes.keys
worked with me but you can try columns
User.columns.map(&:name)
To get the keys in the same order as the columns in the db I used this on Rails 3.2 Ruby 1.8.7:
User.content_columns.collect{|c| c.send(:name)}
my particular use was achieved from a variable with an array of objects
#objects.first.class.content_columns.collect{|c| c.send(:name)}