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how to append a has_many association without hitting the database immediately
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source 'https://rubygems.org' | |
gem 'activerecord', '~> 3.2.18' | |
gem 'sqlite3', '= 1.3.5' | |
gem 'rspec' |
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require "active_record" | |
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ":memory:") | |
RSpec.configure do |config| | |
config.before(:suite) do | |
Class.new(ActiveRecord::Migration) do | |
def change | |
create_table :parents | |
create_table :children do |t| | |
t.references :parent | |
end | |
end | |
end.new.change | |
end | |
end | |
class Parent < ActiveRecord::Base | |
has_many :children, :inverse_of => :parent | |
end | |
class Child < ActiveRecord::Base | |
belongs_to :parent, :inverse_of => :children | |
end | |
describe Child do | |
describe "when new_record" do | |
let(:parent) { Parent.create! } | |
before(:each) { expect(parent).to be_persisted } | |
it "writes to database using <<" do | |
parent.children << subject | |
expect(subject).to be_persisted | |
expect(subject.parent_id).to eq(parent.id) | |
expect(parent.children).to include(subject) | |
end | |
it "does not write to database using using add_to_target" do | |
parent.association(:children).add_to_target(subject) | |
expect(subject).not_to be_persisted | |
expect(subject.parent_id).to be_nil | |
expect(parent.children).to include(subject) | |
parent.save! | |
expect(subject).to be_persisted | |
end | |
end | |
describe "when persisted" do | |
let(:parent) { Parent.create! } | |
subject { described_class.create! } | |
before(:each) { expect(parent).to be_persisted } | |
before(:each) { expect(subject).to be_persisted } | |
it "writes to database using <<" do | |
parent.children << subject | |
expect(subject).to be_persisted | |
expect(subject.parent_id).to eq(parent.id) | |
expect(parent.children).to include(subject) | |
end | |
it "does not write to database using using add_to_target" do | |
parent.association(:children).add_to_target(subject) | |
expect(subject).to be_persisted # Since it already was persisted | |
expect(subject.parent_id).to be_nil # This is less than ideal but will have to do | |
expect(parent.children).to include(subject) | |
parent.save! | |
expect(subject).to be_persisted | |
end | |
end | |
end |
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