Custom model method in where query in Rails 3

Custom model method in where query in Rails 3 - @creators = User.joins(:identities, :roles).select do |u| u.calculate_reach.between ?(5000000, 5999999) end. Something like this might do the

Active Record Query Interface - How to perform various calculations on Active Record models. How to run . 1.1. 3 first. The first method finds the first record ordered by primary key (default).

Active Record Query Interface - Active Record lets you retrieve a single object using three different ways. . This method is analogous to find_each, but it yields arrays of models instead:.

Getting Into Rails Model Queries - If you don't understand Models yet in Rails I suggest reviewing the Rails . When you write regular methods in the model those methods are all instance 3. 4. 5. 6. 7. # /app/models/user.rb. class User < ActiveRecord::Base.

Greatest-Per-Group Query in Rails Using Custom Query Methods - Because Rails dynamically creates attributes on our model for any columns returned Greatest-Per-Group Query in Rails Using Custom Query Methods . Instead, you would need a third named scope that combines the two:

where (ActiveRecord::QueryMethods) - Ruby on Rails latest stable (v5.2.3) - 3 notes - Class: ActiveRecord:: QueryMethods . As an alternative, it is recommended to use one of the following methods. can be used to specify the model if an ActiveRecord object is used as the value.

Rails models cheatsheet - The one-page guide to Rails models: usage, examples, links, snippets, and more . rails g model User. #Using models Advanced query methods .. user = User.create(preferences: %w(one two three)) User.find(user.id).preferences

Using faux ActiveRecord models in Rails 3 - Using faux ActiveRecord models in Rails 3 In fact, the built-in form_for helper method and its associated field This works, but if you're collecting data from more than one field (e.g.: not just a simple search query), your

Writing SQL in Rails: Speed vs. Convenience – Lunar Collective Blog - This article discusses how to write SQL queries in Rails, and the utility The first 3 described below use ActiveRecord::Base.connection and Note the difference ; PG::Result gives different methods than Unlike with ActiveRecord::Base , calling .find_by_sql on a one of your active record models provides

Rails Scopes - Scopes are a great Rails tool to keep stuff DRY and well organized. It's not complicated though, it's just a set of pre-defined queries that You can also use class methods to define scopes. If you ever stumble upon code using a default scope and you want to access models that are outside of that scope,

rails query

Active Record Query Interface - You can also use this method to query for multiple objects. Call the find method and pass in an array of primary keys. The return will be an array containing all of

ActiveRecord::QueryMethods - Rails API - CLASS ActiveRecord::QueryMethods::WhereChain. Methods . allows you to access the address attribute of the User model without firing an additional query.

Active Record Queries - You can join tables manually or query using associations set up by Rails. You can return lists of records or perform basic math like counts and averages.

select (ActiveRecord::QueryMethods) - Second: Modifies the SELECT statement for the query so that only certain fields appended to it, such as the other methods in ActiveRecord::QueryMethods.

where (ActiveRecord::QueryMethods) - In the examples below, the resulting SQL is given as an illustration; the actual query generated may be different depending on the database adapter.

Queries on Rails: extensive guide - Ruby on Rails shines the most when it comes to getting information from relational Queries on Rails - Showcasing Active Record and Arel.

How to use Query Objects to refactor Rails SQL-queries - Ivan Shamatov, mkdev Ruby on Rails mentor, describes Query Objects and explains how to put them into practice.

Queries in Rails, Part 1 - It's a class that is namespaced within the module ActiveRecord , and it allows us to call multiple query methods and chain them. This object is

ActiveRecord: Speed up your SQL queries by reducing loaded data - Find out how to improve and debug ActiveRecord generated SQL queries. Learn how to work with Rails and ActiveRecord to write a more

rails-handbook/Query Objects.md at master · infinum/rails-handbook - Describing the development process used by the Infinum Rails Team. - infinum/ rails-handbook.

rails where multiple conditions

Rails where with multiple conditions - Scopes in ActiveRecord are chainable: User.staff.where(university: @user. university). Chaining .where or scopes creates AND clauses.

where (ActiveRecord::QueryMethods) - #where accepts conditions in one of several formats. If #where is called with multiple arguments, these are treated as if they were passed as . Rails Guides.

Active Record Query Interface - Eager Loading Multiple Associations; Specifying Conditions on Eager Loaded Some of the code shown here will not work in other versions of Rails. If you're

Active Record Query Interface - If you want to specify multiple conditions: information on the dangers of SQL injection, see the Ruby on Rails Security Guide.

OR-ing query conditions on Rails 4 and 3.2 - Security issues with hash conditions in Rails 2 and Rails 3 The reason for this is that in production, multiple worker processes can cause race conditions:.

ActiveRecord Query Building with Multiple and Optional Conditions - ActiveRecord Query Building with Multiple and Optional Conditions 8 Find lets you supply your conditions as a 2-element array with a string, and that got bit by the programming bug real bad when I found Ruby and Rails.

Rails 5 ActiveRecord where, find_by, or, not and Eager - Rails 5 ActiveRecord where, find_by, or, not and Eager Loading .. to chain conditions, or condition, not condition, find_by and eager loading.

[Help] Multiple conditions on Join : rails - Hi there! On the console I have two queries working the way that I want them to: Select all Measures that don't have connections to Report or, if.

Multiple conditions on filters - Ruby on Rails - Is there a more efficient way of coding this? before_filter :f1, unless: :test? before_filter :f2, only: :show, unless: :test? I don't want to call test?

#1627 Allow multiple conditions for callbacks - Ruby on Rails - This patch makes it possible to use :if and :unless together when using callbacks and allows you to add multiple conditions as an array.

rails joins vs includes

Rails Includes vs Joins - Swapnil Gourshete - Confused about includes and joins in Ruby on Rails? Learn how you effectively implement each method in your application today.

Includes vs Joins in Rails: When and where? - Making sense of ActiveRecord joins, includes, preload, and "You wouldn't believe what happened to this Rails developer after . Puma vs.

Making sense of ActiveRecord joins, includes, preload, and - Rails Includes vs Joins. Includes uses eager loading whereas joins uses lazy loading. Both are used when certain operations are meant to be performed on associated tables. And here comes the difference.

Rails :include vs. :joins - It appears that the :include functionality was changed with Rails 2.1. Rails used to do the join in all cases, but for performance reasons it was

Include vs Joins in Rails 5 - Include vs Joins in Rails 5. By Bala Paranj. Aug 13, 2016. Create a new Rails 5 project. rails new commenter. Create the user model. rails g model user name

Preload, Eagerload, Includes and Joins - This blog discusses how it pulls of Preload, Eagerload, Includes and Joins. Rails provides four different ways to load association data. In this

To join or not to join? An act of #includes – Goiabada - Ever wondered how to get rid of those awkward N+1 queries? Join the table as we discuss Rails' eager loading strategies.

'joins' vs. 'includes' in Arel - 'joins' vs. So while “joins” and “includes” both return instances of . For more information about includes and Rails' “Eager Loading”, read on.

preload, eager_load, includes, references, and joins in Rails - Rails, Ruby Nov 11th, 2015 preload, eager_load, includes, references, and blog_id" AS t1_r4 FROM "blogs" LEFT OUTER JOIN "posts" ON "posts". .. Remove N+1 queries in your Ruby on Rails app · Rails :include vs.

includes vs. joins in Rails - Rails Jun 2nd, 2014 includes vs. joins in Rails includes Eager load the included associations into memory. Fire two queries: 1 2 SELECT.

rails find all

Rails: Find all with conditions - @fromcanada = User.find(:all, :conditions => { :country => 'canada' }). edit: As jason328 pointed out, the above answer is deprecated in 3.2,

find (ActiveRecord::Base) - Find all - This will return all the records matched by the options used. . Before Rails 2.1, adding an :include=>[:association] in your find method caused

Active Record Query Interface - Call the find method and pass in an array of primary keys. The return will be an array containing all of the matching records for the supplied primary keys.

ActiveRecord::FinderMethods - Rails API - A convenience wrapper for find(:all, *args) . You can pass in all the same arguments to this method as you can to find(:all) . Source: show.

Rails 5 ActiveRecord where, find_by, or, not and Eager - Find all incomplete tasks with priority 3. Task.where(complete: false).where( priority: 3).all Task Load (0.3ms) SELECT "tasks".* FROM "tasks"

How to find records where column is not null or empty in Rails 4 or 5 - We all know that especially in legacy applications sometimes our database columns are not that well maintained. So we need to query for,

Doing stuff with Rails' find_each - Jon Abrams - If you've been making web apps with Rails for long enough, you will have encountered For example, if you want to find all invalid users:

Rails ActiveRecord: How to find all items that starts with something - Rails ActiveRecord: How to find all items that starts with something? Raw. starts_with.md. Model.where("table_column LIKE :prefix", prefix: "#{keyword}%").

4.4. first, last and all - In certain cases, you may need the first record, or the last one, or perhaps even all records. Conveniently, there is a ready-made method for each case. Let's start

Finding Data with ActiveRecord - Learning Rails [Book] - The find method is common in Rails, usually in controllers. It's constantly used as find (id) to retrieve a single record with a given id , and also used as find(:all) to

rails raw sql

Rails raw SQL example - You can do this: sql = "Select * from your sql query here" records_array = ActiveRecord::Base.connection.execute(sql). records_array would

Rails 4, raw query using ActiveRecord - Is there currently a way to do a raw SQL select query using ActiveRecord in Rails 4.0.0.beta1? I see ActiveRecord::Base.execute no longer

Writing SQL in Rails: Speed vs. Convenience – Lunar Collective Blog - Introduction. This article discusses how to write SQL queries in Rails, and the utility of some ways over others. The deciding factors discussed

Active Record Query Interface - This Guide is based on Rails 3.0. Some of the code shown here will not work in other versions of Rails. If you're used to using raw SQL to find database records,

Active Record Query Interface - If you're used to using raw SQL to find database records, then you will generally find that there are better ways to carry out the same operations in Rails. Active

How to use ActiveRecord to Execute SQL Query - in the database.yml . $ rails c Loading development environment (Rails 4.2.6) Now, we can execute SQL query using that connection.

Raw SQL on Rails - ActiveRecord is fantastic, but sometimes if you are doing complex joins and such, you may need to move away from ActiveRecord and write

Rails 5.2 disallows raw SQL in dangerous Active Record methods - This blog is part of our Rails 5.2 series. We sometimes use raw SQL in Active Record methods. This can lead to SQL injection vulnerabilities

Working with complex SQL statements in Rails and ActiveRecord - Rails (via ActiveRecord) makes it super easy to work with your data, and for We are going to basically construct a raw SQL query, and take

Is there a general hate for raw SQL in the rails community - I just started writing ruby on rails as part of my transition from Java. I work in a team where raw SQL is greatly discouragedto a point where

rails includes

A Visual Guide to Using :includes in Rails - If you're new to developing Rails applications, you've probably come across the term N + 1 queries. You probably also know that this is

includes (ActiveRecord::QueryMethods) - includes. Importance_3. Ruby on Rails latest stable (v5.2.3) - 1 note - Class: users = User.includes(:address) users.each do |user| user.address.city end.

Making sense of ActiveRecord joins, includes, preload, and - Making sense of ActiveRecord joins, includes, preload, and eager_load author " = $1 => ["One weird trick to better Rails apps", "1,234 weird

Active Record Query Interface - The methods are: find; create_with; distinct; eager_load; extending; from; group; having; includes; joins; left_outer_joins; limit; lock; none; offset; order; preload

Includes vs Joins in Rails: When and where? - Confused about includes and joins in Ruby on Rails? Learn how you effectively implement each method in your application today.

Rails Includes vs Joins - Swapnil Gourshete - When I started learning Rails, I was always in a state of confusion about using includes or joins, because both are used in almost same

Rails includes with conditions - You can specify conditions on includes for eager loading like this . Quite hacky, but following seems to work, at least on rails 5.

→ Eager Loading (preloading) - You are probably already familiar with the method #includes for eager loading data from database if you are using Rails and ActiveRecord.

Conditional Eager Loading in Rails – Runtime Revolution - One of the most common performance issues that can affect a rails You just need to call the includes method on the Model with the

How to preload Rails scopes - Rails' scopes make it easy to find the records you want: app/models/review.rb Now, you can preload your new association with includes : irb(main):001:0>