Recent questions tagged activerecord

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activerecord - Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?

I have been unable to find any documentation on the .build method in Rails (i am currently using 2.0.2). ... I find any documentation on this method? Thank you Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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545 views

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activerecord - How do you discover model attributes in Rails?

I am finding it difficult to easily see what attributes/properties exist on all of my model classes since they ... between schema file & model file constantly? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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activerecord - How to do a LIKE query in Arel and Rails?

I want to do something like: SELECT * FROM USER WHERE NAME LIKE '%Smith%'; My attempt in Arel: # params[: ... any matches to the query. How would that work? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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580 views

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activerecord - Case-insensitive search in Rails model

My product model contains some items Product.first => #<Product id: 10, name: "Blue jeans" > I'm now ... as a migration that imports the data. Any ideas? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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504 views

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activerecord - Is there a way to get a collection of all the Models in your Rails app?

Is there a way that you can get a collection of all of the Models in your Rails app? Basically, can I do ... Models.each do |model| puts model.class.name end Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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576 views

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activerecord - Add a method to an Object's ActiverecordRelation

I have a model School with a has_many relationship with PerformanceStats. I find myself often writing this ... /questions/65865603/add-a-method-to-an-objects-activerecordrelation...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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579 views

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activerecord - Rails 6 API Only - Namespace Models - Can not resolve the namespace models in controllers

I have namespace models like so # /app/models/metadata.rb module Metadata class << self def table_name_prefix " ... -namespace-models-can-not-resolve-the-namespace-models-in-co...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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547 views

1 answer

activerecord - Why does updating a model trigger rails to load other models?

I've got a weird behavior on my project. If I update/save a record on my ::Product model, rails always ... 65938886/why-does-updating-a-model-trigger-rails-to-load-other-models...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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616 views

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activerecord - Copy model instances in Rails

I have a model Foo with attributes id, name, location. I have an instance of Foo: f1 = Foo.new f1 ... from:https://stackoverflow.com/questions/1262546/copy-model-instances-in-rails...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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689 views

1 answer

activerecord - Rails idiom to avoid duplicates in has_many :through

I have a standard many-to-many relationship between users and roles in my Rails app: class User < ActiveRecord: ... /1315109/rails-idiom-to-avoid-duplicates-in-has-many-through...