T.string :field_type, default: 0, limit: 2, null: falseĪdd_index :custom_fields, %i, unique: true T.belongs_to :shop, null: false, foreign_key: class CreateProducts < ActiveRecord::Migration rails generate scaffold Product name:string description:text price:decimalĬhange code inside migration file to this. We should create a table for products that will be extended by custom fields and belongs to the Shop. class CreateShops < ActiveRecord::MigrationĪdd validation for the name in the Shop model. If you want to create the models, views, and controllers for a new resource in a single operation, scaffolding is the tool for the job.Ĭhange migration file for shops table in db/migrate folder to this. *Rails scaffolding is a quick way to generate some of the major pieces of an application. Let’s start from the first step by scaffolding resources for the Shop model. Our goal is to create a Rails application where users can create their own shop with products that will have custom fields. If you can’t wait to look at the ready Rails application with custom fields, check it out here. I suppose you’re familiar with Ruby, Ruby on Rails, HTML, SCSS, Javascript, and Git to the start work with this tutorial. Let’s Beginīefore starting, you should have bootstrapped the Rails app with Postgres as a database. Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database. What is ActiveRecord object?Īctive Record in Ruby on Rails Architecture is the M in MVC – the model is the layer of the system responsible for representing business data and logic. These requirements can be solved using a JSON data type in PostgreSQL, which allows you to store key/value structures, just like a dictionary or hash. The list of potential fields that you can associate with a product is endless, and creating a column for all of them in a product table will obviously not work. Or maybe you just want to add an additional_price. But different kinds of products may have different types of fields like location to keep track of the product’s site. A product usually has fixed fields like name, description, price, and so on. One example might be a model for products. Sometimes when we’re developing an application, we run into situations when we don’t know precisely what types of fields we need for a model or requirements. In this article, you can find information on developing custom fields feature for ActiveRecord objects using Postgres JSON fields and decorator patterns. Also, Eduard is passionate about building clean architecture in Rails Applications. ![]() Currently, he maintains a platform that provides water utilities and facility managers with the tools to prevent FOG (fat, oil, and grease) from entering sewer and drainage systems. Probably your problem in quotation: Submission.joins(:fmp_session).Eduard Horiach is a Ruby on Rails Developer at Syndicode. Id | integer | not null default nextval('fmp_sessions_id_seq'::regclass)Īnd the schema create_table "fmp_sessions", force: :cascade do |t| Additionally you should know Column | Type |Modifiers To show the database portion, here is the table description (from psql) and the the schema.db segments for this table. ![]() Help me find the right query to join one table to another and search an json array field for a specific string. In theory, this would search the project_data array, and searches it with #> so it doesn't matter how many elements are in the array - but I have tried close to 40 machinations of the query and am stuck. I was thinking something like this: Submission.joins(:fmp_session).where( I'd rather stick with activerecord or sql (or mix and match) and leave AREL alone. So what I want is an active record array of all submissions if the fmp_session.project_data 'type' json key equals 'CREW'. The main model is Submission, which has_one :fmp_session - FmpSession has a field : project_data, which is a postgresql :json type field, containing a json array. I want to get a list of Model which have a specific "type" field inside of a json array column using postgresql.Ĭould someone point me in the right direction, also, I am fine with this being a class level method instead of a scope, I just need a list of all the Model.objects. Seriously struggling to come up with a rational scope.
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