Recent questions tagged ActiveRecord

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activerecord - Duplicating a record in Rails 3

I have a prescription model in my Rails 3 application. I am trying to work out the best method of allowing ... for the intial data entry. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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658 views

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activerecord - Ruby on Rails: updated_at - set as 0 on creation

When I create a new record on query table, I want updated_at (timestamp) to be '0000-00-00 00:00:00' - and not ... :40:15') How do I fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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754 views

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activerecord - rails - using :select(distinct) with :has_many :through association produces invalid SQL

User has_many :posts has_many :post_tags, :through => :posts PostTag belong_to :post belongs_to :tag scope :distincttag, ... or a bug? thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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activerecord - Rails attr_readonly doesn't work

According to this question and the documentation of attr_readonly the following should be possible: class MyModel < ... What am I mising? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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610 views

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activerecord - Update with limit 1 in codeigniter use active record

I'm trying to update a single record with the active record of codeigniter and it still fails. $data = array(' ... the limit What is the error See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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715 views

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activerecord - Create missing auto increment attribute with rails migration

I'm writing a migration to convert a non-rails app into the right format for rails - one of the ... maybe with change_column or something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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activerecord - Codeigniter - Batch Update with Multiple Where Conditions

For starters, the Codeigniter documentation on update_batch does not exist. kenjis was kind enough to provide ... EllisLab/CodeIgniter/pull/448 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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636 views

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activerecord - Rails habtm and finding record with no association

I have 2 models: class User < ActiveRecord::Base has_and_belongs_to_many :groups end class Group < ActiveRecord::Base ... Rails 3.0.9) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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activerecord - Rails how to set a temporary variable that's not a database field

For my app, I have different signup entry points that validate things differently. So in the main signup, nothing ... to achieve this? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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548 views

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activerecord - Rails how to set a temporary variable that's not a database field

For my app, I have different signup entry points that validate things differently. So in the main signup, nothing ... to achieve this? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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906 views

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activerecord - Yii2 active record model not saving data

I've built a simple form model & view, a simple AR model, and a simple controller. The form model assigns the correct ... ' => $model, ]); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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561 views

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activerecord - Many-to-many self join in rails?

Rails documentation provides a nice explanation of how to handle a self join where only a has_many-belongs_to ... followed by many users? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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activerecord - Many-to-many self join in rails?

Rails documentation provides a nice explanation of how to handle a self join where only a has_many-belongs_to ... followed by many users? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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666 views

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activerecord - Rails Associations has_one Latest Record

I have the following model: class Section < ActiveRecord::Base belongs_to :page has_many :revisions, :class_name ... or through associations? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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535 views

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activerecord - How do I get Rails to eager load counts?

This is related to a question a year and change ago. I put up an example of the question that should work ... overlooked (very, very likely)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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597 views

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activerecord - Rails: Exception in after_create stopping save

Simple question. I have a ActiveRecord model that I want to perform post processing on AFTER the record ... something funky happening? Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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690 views

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activerecord - rails model has_many of itself

I have a event model. Events can have parent events, set from a column in the model (parent_event_id). I need ... ", :default => false end See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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675 views

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activerecord - In rails, how can I find out what caused a .save() to fail, other than validation errors?

I have an ActiveRecord model which is returning true from valid? (and .errors is empty), but is returning false ... s causing the save to fail? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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535 views

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activerecord - Rails model that has both 'has_one' and 'has_many' but with some constraints

I am mapping 2 models: User Account class Account has_many :users class User has_one :account The user table as ... a single primary user also. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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673 views

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activerecord - Rails Joins and include columns from joins table

I don't understand how to get the columns I want from rails. I have two models - A User and a Profile. A ... doesn't have attributes for User... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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704 views

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activerecord - Rails: what does schema.rb do?

I used to think the db/schema.rb in a Rails project stored the database schema, so that ActiveRecord can know ... does schema.rb really do? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

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activerecord - CodeIgniter Active Record - Get number of returned rows

I'm very new to CodeIgniter and Active Record in particular, I know how to do this well in normal SQL but ... Active Record class? Thanks, Tom. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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529 views

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activerecord - Saving multiple objects in a single call in rails

I have a method in rails that is doing something like this: a = Foo.new("bar") a.save b = Foo.new("baz") ... am I stuck doing it one at a time? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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456 views

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activerecord - Rails filtering array of objects by attribute value

So I perform a query to the db and I have a complete array of objects: @attachments = Job.find(1).attachments ... memory instead of a db query. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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531 views

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activerecord - MongoDB vs MySQL

I used to build Ruby on Rails apps with MySQL. MongoDB currently become more and more famous and I am now starting ... help me to figure it out? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

1 answer

activerecord - How to turn off auto_increment in Rails Active Record

Is it possible to create primary key without auto_increment flag in ActiveRecord? I can't do create ... primary key without auto_increment? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

1 answer

activerecord - Rails: uniq vs. distinct

Can someone briefly explain to me the difference in use between the methods uniq and distinct? I've seen both used ... isnt quite clear to me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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554 views

1 answer

activerecord - CodeIgniter: INSERT multiple records without cycle

It's possible to use multiple INSERT records in CodeIgniter Active Record without for, foreach and etc. ? My current ... 'topic_tags', $data); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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