ActiveRecord | Object-relational mapping | Database library
kandi X-RAY | ActiveRecord Summary
kandi X-RAY | ActiveRecord Summary
Connections, models and active records are the foundations of everything that concerns database access and management. They are used to establish database connections, manage tables and their possible relationship, as well as manage the records of these tables. Leveraging OOP, the models and active records are instances which properties, getters/setters and behavior can be inherited in a business logic. Using the query interface, you won't have to write raw SQL, manage table relationship, or worry about injection. Finally, using providers you can define all your connections and models in a single place. Connections are established and models are instantiated on demand, so feel free the define hundreds of them.
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Top functions reviewed by kandi - BETA
- Save callback .
- Parse the conditions .
- Find many records .
- Get the formatted field type .
- Resolve model attributes .
- Prepare a statement .
- Create indexes of given type .
- Sets a has many relation .
- Check if this record is new .
- Execute the statement .
ActiveRecord Key Features
ActiveRecord Examples and Code Snippets
Lines of Code : 90License : Non-SPDX (NOASSERTION)
Copyfind(10);
$records = $model->find(10, 15, 19);
# or
$records = $model->find([ 10, 15, 19 ]);
where('is_online = ?', true);
$model->where([ 'is_online' => true, 'is_home_excluded' => false ]);
$model->where('site_id = 0 OR site_id [
// …
Model::SCHEMA => [
'nid' => 'serial',
'title' => 'varchar'
// …
]
],
'contents' => [
// …
Model::EXTENDING => 'nodes'
]
]);
'contents where('is_online = ?', $_GET['online']);
where('is_online = ? AND is_home_excluded = ?', $_GET['online'], false);
where('is_online = ?', $_GET['online'])->and('is_home_excluded = ?', false);
where([ 'is_online' => $_GET['online'], 'is_home_e Community Discussions
Trending Discussions on ActiveRecord
QUESTION
I ran bundle update rails and got this. I'm stumped. If activerecord-session_store 2.0 depends on a version of actionpack between 5.2.4.1 and above, and if actionpack is a dependency of Rails 6, shouldn't this be ok?
ANSWER
Answered 2021-Jun-14 at 23:35Hmm; if I try bundle install with your Gemfile I get
QUESTION
In an effort to create a Short, Self Contained, Correct (Compilable), Example, imagine that I want to do the following.
I have a blog website. There are two types of posts, TextPost and LinkPost. There are also two types of users, User and Guest. I would like to implement Multiple Table Inheritance with TextPost and LinkPost, by which I mean (hopefully I'm using the term correctly):
- At the model level, I will have
Post,TextPostandLinkPost.TextPostandLinkPostwill inherit fromPost. - At the database level, I will have tables for the "leaf" models of
TextPostandLinkPost, but not forPost.
Each type of Post can belong to either a User or a Guest. So we have a polymorphic belongs_to situation.
My question is how to accomplish these goals.
I tried the following, but it doesn't work.
...ANSWER
Answered 2021-Jun-12 at 04:58The names of constants look like the names of local variables, except that they begin with a capital letter.
All the built-in classes, along with the classes you define, have a corresponding global constant with the same name as the class called
class name.
So in your case, when you define User class, there's a constant class name: User, but not user, that why the error NameError (wrong constant name user) is raised.
try text_post = TextPost.create(title: 'foo', content: 'lorem ipsum', author_id: 1, author_type: 'User')
QUESTION
Class shop
ANSWER
Answered 2021-Jun-11 at 18:55I'll refer to part of your question since you are raising a couple of issues:
Since Rails 6.1 form_with is non ajax by default so to make it ajax you have to pass local: false or set the global config option (config.action_view.form_with_generates_remote_forms) to true.
Compare form_with Rails 5.2 documentation .
:local - By default form submits are remote and unobtrusive XHRs. Disable remote submits with local: true.
With Rails 6.1
:local - By default form submits via typical HTTP requests. Enable remote and unobtrusive XHRs submits with local: false. Remote forms may be enabled by default by setting config.action_view.form_with_generates_remote_forms = true
Another thing I see is you're not doing anything with the shopzone params, but even if this will work reconsider how you built this, this is not standard use of nested attributes.
QUESTION
We do use .to_yaml on ActiveRecord to dump some values of a record in to a .yml file for backup reasons.
Those files are stored into a repository as those backup data is part of defaults for setup new systems.
Example:
...ANSWER
Answered 2021-Jun-11 at 15:11The issue is with lines that include only spaces.
These will format how you want:
QUESTION
Trying to mock an ActiveRecord model class in RSpec unit test. Here I'm summarizing stuff.
RSpec test
...ANSWER
Answered 2021-Jun-10 at 21:52Your mocking expectations should happen in the test before the code is calling them, so
QUESTION
In Rails 6.1, I would like to rename a column and convert the underlying data in a single migration:
...ANSWER
Answered 2021-Jun-10 at 13:54You have to rename it inside change_table if you want it to work as you are using it now.
QUESTION
I'm trying to implement a comment feature using rails 6 and jQuery, but what I want for a user can add comments to posts without refreshing the browser, I create a comment_controller.rb and the model comment.rb,
Then I associate the post and user and comment models by has_many: comments, and belongs to user and post, but the issue is when I'm trying to create a post I found this error :
ANSWER
Answered 2021-Jun-10 at 10:52You are getting the error because your view is expecting @post to exist but it was not defined. You can modify CommentsController#create to include the created comment's post.
QUESTION
I'm trying to use Ransack on RoR app. https://github.com/activerecord-hackery/ransack
Unfortunately latest ransack only support ruby 2.6+. Mine is 2.5.8. So what should I do? Any available version is there on Ransack?
...ANSWER
Answered 2021-Jun-10 at 08:47You can use an older version, namely 2.4.1.
If you look on rubygems.org, you can quickly see the minimum required ruby version for each version of the gem:
However, you shouldn't even ordinarily need to check this manually!! If you run bundler update ransack on a project, it will automatically fetch the latest compatible version of the gem, given all your other dependencies.
QUESTION
Looked through past posts on SO but couldn't find the solution.
Environment:
- Mac OS Big Sur
- Rails 6.1.3.2
- ruby 3.0.1p64
Github repo https://github.com/tenzan/ruby-bootcamp
Added Bootsrtap 5 according to https://blog.corsego.com/rails-6-install-bootstrap-with-webpacker-tldr
To push to heroku I ran git push heroku main
Output:
...ANSWER
Answered 2021-Jun-10 at 00:32ModuleNotFoundError: Module not found: Error: Can't resolve '@popperjs/core' suggests that you need to install @popperjs/core.
QUESTION
Normally I understand that if you pass an array of values to an ActiveRecord query it executes it like an OR statement. That is to say:
Parent.joins(:kiddos).where(kiddos: {rando_attr:[1,2]})
This query looks for Parent objects where the parent object has a kiddo object that has rando_attr of EITHER 1 OR 2.
In my case however, I want to look for Parent object where the parent object has a kiddo object with rando_attr of 1, AND ALSO has a kiddo object with rando_attr of 2.
How would I write this query?
...ANSWER
Answered 2021-Jun-09 at 06:33Parent.joins(:kiddos)
.where(kiddos: {rando_attr:[1,2]})
.group(:id).having('COUNT(DISTINCT(kiddos.rando_attr)) = 2')
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