activerecord

问题 I have the following models in Rails: Player Match Series And a Post model: Post I want to link each post to one of the above model. Need to create a new table that will have Object_type - player or match or series Object_id - Id of above object Post_id Is there a built in way to create such relationship in rails? and easily access a player's post like player.posts? (that will filter for object_type = 'player' in this relationship table) 回答1: Use Polymorphic Associations to manage

问题 I'm creating a sports application which allows users to create pinboards, as many as they like. The users can then add say their favorite player to a specified pinboard. So for example User: Jack, creates a new pinboard called "My favorite defenders", He can then go and find his favorite defenders, say Kevin Garnet, and add/pin garnet to his "My favorite defenders" Pinboard. I have a Users model, a Pinboards Model and a Players model. I tried the following association but didn't work as I

问题 I have a form : <?php $attr = array('id'=>'urlSubmit'); $urlInputAttr = array('name'=>'urlInput','value'=>'yourdomain.com','maxlength'=>'50','size'=>'25'); echo form_open('urlSubmission',$attr); echo form_input($urlInputAttr); #echo form_submit('urlInput', ''); echo form_close(); ?> a controller called **urlsubmission** # Determine whether domain already has been crawled. $this->load->model('domaincheckmodel'); $this->domaincheckmodel->verifyduplicates(); and a function within a model

问题 If I had the following table. create_table :my_table, :id => false do |t| t.string :key_column t.string :value_column end How would I ensure that the rows are optimaly stored for binary search by the field of :key? And how would I make sure binary search is used? 回答1: For any interesting number of rows, the optimal way (for most definitions of "optimal") to access a single random record by key is to create an index. CREATE INDEX my_index ON my_table ( key_column ); or in an ActiveRecord

问题 I have a following query $this->db->set('registerStep', $param) ->where('id = ',$user_id) ->update($this->table_name); Above Query is producing below sql code. even though I'm supplying only one where condition. UPDATE `users` SET `registerStep` = 2 WHERE `id` = 33 AND `id` = '165' I think active record is using some cached where condition, is there any way I can free where condition. I tried using $this->db->flush_cache(); But it's not helping. 回答1: http://codeigniter.com/user_guide/database

问题 render @some_object will render Rails.root/app/views/some_objects/_some_object.html.erb Now I want to handle which partial will be rendered depends on its data_type field. For example: class SomeObject < AR::Base # some magick method wich I need to rewrite def partial_name case data_type when "String" "string_template" when "Text" "text_template" else "blank_template" end end end I know there is model_name , i18n_key and some others, which are returnes model name, but which one is used in my

问题 SQLite3::SQLException: no such column: organizations.user_id: SELECT "organizations".* FROM "organizations" WHERE "organizations"."user_id" = 2 I have setup my models like this: User: User has_many :organizations Organization: attr_accessible :name, :founder, :founder_id belongs_to :founder, :class_name => 'User' Schema: create_table "organizations", :force => true do |t| t.string "name" t.integer "founder_id" When I go to edit a user in rails-admin, I get this message: `SQLite3::SQLException

问题 I am invoking a stored procedure (MySQL) from my model. This stored procedure returns a resultset, but i get this error... Mysql2::Error: PROCEDURE my_db.sp_venue_nearby_with_questions can't return a result set in the given context:.... Here's the rails code i use - connection.select_all("call sp_some_proc()") I have tried "connection.execute" as well, that fails as well. I have successfully been able to invoke another stored proc from my model, but that one does not return a resultset. 回答1:

问题 I have a Active Model Serializer that has the following: class API::DashboardSerializer < ActiveModel::Serializer attributes :id, :name, :special def special x = object.check_ins.first prev = x.prev_ci_with_weigh_in end end where special returns a record of class CheckIn and I'd like it to use the CheckInSerailizer for that record. How can I force it to use the CheckInSerializer in special ? 回答1: Remove special from attributes and then try has_one or belongs_to , described in this Guide, like

问题 Im working on creating a game in rails and I ran into a problem for creating the scoring logic. I have a model called Score which belongs to a user and has total_points as an attribute. So every time a user creates a post(or whatever) I would like to automatically adjust the users total_score attribute. I have a feeling that I could create a method somewhere in the score model but haven't done this before so I'm a bit confused. 回答1: This is good use case for a ActiveRecord callback. #post.rb