activerecord

问题 Following are the 1-to-M models: class FotoGossip < ActiveRecord::Base has_many :uploads attr_accessible :published_at, ... end class Upload < ActiveRecord::Base belongs_to :foto_gossip end Now I want the Uploads.all with the condition :published_at NOT NULL of the corresponding upload's parent model? 回答1: Just add this to your Upload model: named_scope :with_published_foto_gossip, :joins => :foto_gossip, :conditions => "foto_gossips.published_at IS NOT NULL" then you can get all the uploads

问题 Here is the scenario. I'm writing my geo-ruby oracle adapter for Ruby On Rails which supports working with SDO_GEOMETRY out of box. It was going well. I wrote codes for selecting SDO_GEOMETRY objects from Oracle DB successfully. Everything ruins up when I wanted to write insert and update parts. Following is what's in my mind. I want to be able to do this statement: g = GeoShape.new(name:"point1", shape: Point.from_x_y(-34,-43,4326)) g.save I generated following sql query from the above

问题 I try to use rails 3.1 ActiveModel::SecurePassword by following http://bcardarella.com/post/4668842452/exploring-rails-3-1-activemodel-securepassword and I end up with red light ... user.rb class User < ActiveRecord::Base has_secure_password validates :password, :presence => { :on => :create } end factory.rb Factory.define :user do |f| f.email "foo@bar.com" f.password "foobar" f.password_confirmation { |u| u.password } end spec_user.rb describe User do it "should authenticate with matching

问题 I try to use rails 3.1 ActiveModel::SecurePassword by following http://bcardarella.com/post/4668842452/exploring-rails-3-1-activemodel-securepassword and I end up with red light ... user.rb class User < ActiveRecord::Base has_secure_password validates :password, :presence => { :on => :create } end factory.rb Factory.define :user do |f| f.email "foo@bar.com" f.password "foobar" f.password_confirmation { |u| u.password } end spec_user.rb describe User do it "should authenticate with matching

问题 I finding this a bit mind bending and would like some ideas. My design goes likes this: There is builders table, each builder can have a postal address There is a clients table, each client can have a postal address and a billing address There is an addresses table I need to define the associations between the builders-addresses and clients-addresses My initial database design was like this: Builders -------------------- id postal_address_id ... Clients -------------------- id postal_address

问题 Im new to rails and I want to make a select query based on diffrent GET params (filtering and sorting). Can I some how add conditions to find in the code? For example: if params[:ratings] Movie.where(:rating => params[:ratings].keys) end and then add ordering and other where conditions. How can I achive this? Maybe there is a better way to dybamicly modify select query (without making SQL string). Thanks. 回答1: The where , order , ... methods return ActiveRecord::Relation objects so you can

问题 I have a model method that I'd like to call from various controllers. It looks something like this: def Post < ActiveRecord::Base def read! self.read_at = Time.now self.save self.thread.status = Status.find_by_name("read") self.thread.save end end In my controller, if I call @post.read! , will this rollback on any errors? 回答1: In your current setup, if read_at gives an error, it will still continue onto the code that executes thread.status for example. You want to use ActiveRecord

问题 I'm new to Rails and I'm not sure why my chaining isn't working. Working my_model.select('name').where('status_id = 6').all Not Working my_model.select('name').where('status_id = 6').order('name') Why does chaining the order after the where not execute the query? I've tried adding the .all after the .order but that didn't seem to work either. 回答1: Looks like this is a known bug in the jdbc adapter: http://kenai.com/jira/browse/ACTIVERECORD_JDBC-154 If you make these changes it will fix it:

问题 I would like to get the records that have their created_at date closest to the current date. How can I do this with active records' where clause? 回答1: You could find the closest record in the past with something like: Record.where("created_at <= ?", Date.today).order_by("created_at DESC").limit(1) Similarly, you can have the closest record in the future Record.where("created_at >= ?", Date.today).order_by("created_at ASC").limit(1) And then compare wich one is the closest to current date...

问题 Surely, I can Yii::$app->db->createCommand($sql)->query() , but what if I wanna use a ActiveRecord::find()->where($conditions) to do this job ? 回答1: Here is one of the options with using yii\db\Expression : use yii\db\Expression; ... $models = Customer::find() ->select(['id', 'name', ...]) ->where(new Expression('id % 2 = 1')]) ->all(); It's definetely better than raw sql and ['%2=', 'id', 1] because it follows the order and more readable in my opinion. ['%2=', 'id', 1] also is not suitable