activerecord

问题 In my model example Game, has a status column. But I usually set status by using symbols. Example self.status = :active MATCH_STATUS = { :betting_on => "Betting is on", :home_team_won => "Home team has won", :visiting_team_won => "Visiting team has one", :game_tie => "Game is tied" }.freeze def viewable_status MATCH_STATUS[self.status] end I use the above Map to switch between viewable status and viceversa. However when the data gets saved to db, ActiveRecord appends "--- " to each status. So

问题 Using Mac OSX Yosemite (10.10.4): rails -v => Rails 4.2.3 ruby -v => ruby 2.2.2p95 Followed a combination of these instructions: https://www.digitalocean.com/community/tutorials/how-to-setup-ruby-on-rails-with-postgres and these instructions: http://blog.endpoint.com/2014/03/setup-rails-environment-with-postgresql.html bash: $createuser -P -d -e project (This was successful) $password: aPassword $re-enter password: aPassword $rails new project --database=postgresql $cd project/config/database

问题 First, let me set the stage: I have an app_settings table that joins app_setting_options with user_id , user_role_id , event_id , group_id , or app_level_setting . For any given app_setting there should be a specific app_setting_option_id and only one of those other objects. For each one of those secondary objects, I have specified a uniqueness validation with a scope in the AppSetting model: validates :user_id, uniqueness: { scope: :app_setting_option_id}, allow_nil: true validates :user

问题 This is the first time I've tried out Rails with PostgreSQL. I am confused by the lack of timestamp with timezone usage in code I usually see regarding columns storing absolute time. A prime example is devise, it stores columns a datetime column which translates to a timestamp with out timezone in PostgreSQL. I consider it a bad practice because timestamp with out timezone could mean any time zone. If you were accessing the database from another application, you would have no idea which time

问题 I am having issues with a particular like in my active records query. When I use join('users parent', 'child.treePath LIKE CONCAT(parent.treePath,"%")') Code igniter spits out JOIN 'users' parent ON 'child'.'treePath' 'LIKE' CONCAT(parent.treePath,"%") (note that I have replaced all back ticks ( ` ) with ( ' ) due to markdown :/) So, the issue is that code igniter is wrapping LIKE in ( ` ). How can I tell it to not attempt to format this block? Complete query: $this->db->select('child.uuid')

问题 I want to update multiple rows in the database with codeigniters update_batch() function. But the field specified in the where should also be changed. The following code should make it clear: $set = array( array( 'token' => '65787131678754', 'device' => 'none', 'new_token_value' => '' ), array( 'token' => '75798451315464', 'device' => 'none', 'new_token_value' => '' ) ); $this->db->update_batch(TBL_NAME, $set, 'token'); Tokens specified in token should be updated with device to 'none' and the

问题 Here is my DataProvider: $dataProvider = new ActiveDataProvider([ 'query' => $query, 'pagination' => ['pageSize' => 50], 'sort' => [ 'defaultOrder' => [ 'priority' => SORT_DESC, 'date_targeted' => SORT_ASC ] ] ]); What I want is to move ("not set") to the end of the results. How can I do this? 回答1: You may add new field in select . And set in IF case like that: $query->select([ '*', new \yii\db\Expression('IF(date_targeted IS NULL, 1, 0) AS date_targeted_flag') ]); And in sort add date

问题 I experienced a horrible problem today as a result of differences between Rail's production and development environments. Consider the code: "select * from subscription_plans where affiliate_id is null or affiliate_id = #{@subscription_plan.affiliate.id rescue 0};" There will never be any affiliates with an id of 0, so if @subscription_plan.affiliate is nill I expected the query to return only subscription plans without an affiliate. Works great in development environment because nil.id

问题 I am working a library that needs to be fed sql queries as strings todo its job. I am using CodeIgniter and the active record implementation of their database class. I know that I can echo the SQL statement like so... But I only want to generate this query, not execute it. echo $this->db->last_query(); Any help accomplishing this would be great! 回答1: The last_query() function you are using returns the query string, it doesn't execute the it. Try assigning the function return to a variable for

问题 I need to query a database table and get the rows ordered by a count of an association. Is there a Rails (like Active Record Query) way to do this? My models and their associations are as follows: class User < ActiveRecord::Base has_one :business end class Business < ActiveRecord::Base has_many :postulations end class Postulation < ActiveRecord::Base belongs_to :business end I need to get a number of Users ordered by the amount of Postulations that their Business has. Is there a clean way to