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ActiveRecord compatible association reflection
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| # encoding: UTF-8 | ||
| require 'mongo_mapper/plugins/reflect_on_association/active_record_association_adapter' | ||
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| module MongoMapper | ||
| module Plugins | ||
| # Provides a reflect_on_association method that returns an ActiveRecordAssociationAdapter for an association. | ||
| # This adapter has an API that is a subset of ActiveRecord::Reflection::AssociationReflection. This allows | ||
| # MongoMapper to be used with the association helpers in gems like simple_form and formtastic. | ||
| module ReflectOnAssociation | ||
| extend ActiveSupport::Concern | ||
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| module ClassMethods | ||
| def reflect_on_association(name) | ||
| ActiveRecordAssociationAdapter.for_association(associations[name]) if associations[name] | ||
| end | ||
| end | ||
| end | ||
| end | ||
| end |
33 changes: 33 additions & 0 deletions
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lib/mongo_mapper/plugins/reflect_on_association/active_record_association_adapter.rb
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| # encoding: UTF-8 | ||
| module MongoMapper | ||
| module Plugins | ||
| module ReflectOnAssociation | ||
| class ActiveRecordAssociationAdapter | ||
| attr_reader :klass, :macro, :name, :options | ||
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| def self.for_association(association) | ||
| macro = case association | ||
| when MongoMapper::Plugins::Associations::BelongsToAssociation | ||
| :belongs_to | ||
| when MongoMapper::Plugins::Associations::ManyAssociation | ||
| :has_many | ||
| when MongoMapper::Plugins::Associations::OneAssociation | ||
| :has_one | ||
| else | ||
| raise "no #{name} for association of type #{association.class}" | ||
| end | ||
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| new(association, macro) | ||
| end | ||
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| def initialize(association, macro) | ||
| @klass, @name = association.klass, association.name | ||
| # only include compatible options | ||
| @options = association.options.slice(:conditions, :order) | ||
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| @macro = macro | ||
| end | ||
| end | ||
| end | ||
| end | ||
| end |
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| Original file line number | Diff line number | Diff line change |
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| require 'test_helper' | ||
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| module ReflectOnAssociationTestModels | ||
| class Tree | ||
| include MongoMapper::Document | ||
| many :birds, :class_name => "ReflectOnAssociationTestModels::Bird" | ||
| end | ||
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| class Bird | ||
| include MongoMapper::Document | ||
| belongs_to :tree, :class_name => "ReflectOnAssociationTestModels::Tree" | ||
| end | ||
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| class Book | ||
| include MongoMapper::Document | ||
| many :authors, :class_name => "ReflectOnAssociationTestModels::Author", :in => :author_ids | ||
| end | ||
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| class Author | ||
| include MongoMapper::Document | ||
| end | ||
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| class Employee | ||
| include MongoMapper::Document | ||
| one :desk, :class_name => "ReflectOnAssociationTestModels::Desk" | ||
| end | ||
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| class Desk | ||
| include MongoMapper::Document | ||
| belongs_to :employee, :class_name => "ReflectOnAssociationTestModels::Employee" | ||
| end | ||
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| class Order | ||
| include MongoMapper::Document | ||
| many :line_items, :class_name => "ReflectOnAssociationTestModels::LineItem" | ||
| end | ||
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| class LineItem | ||
| include MongoMapper::EmbeddedDocument | ||
| end | ||
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| class Body | ||
| include MongoMapper::Document | ||
| one :heart, :class_name => "ReflectOnAssociationTestModels::Heart" | ||
| end | ||
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| class Heart | ||
| include MongoMapper::EmbeddedDocument | ||
| end | ||
| end | ||
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| class ReflectOnAssociationTest < Test::Unit::TestCase | ||
| context "one-to-many association" do | ||
| should "return :has_many association for Tree#birds" do | ||
| association = ReflectOnAssociationTestModels::Tree.reflect_on_association(:birds) | ||
| association.klass.should == ReflectOnAssociationTestModels::Bird | ||
| association.macro.should == :has_many | ||
| association.name.should == :birds | ||
| association.options.should == {} | ||
| end | ||
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| should "return :belongs_to association for Bird#tree" do | ||
| association = ReflectOnAssociationTestModels::Bird.reflect_on_association(:tree) | ||
| association.klass.should == ReflectOnAssociationTestModels::Tree | ||
| association.macro.should == :belongs_to | ||
| association.name.should == :tree | ||
| association.options.should == {} | ||
| end | ||
| end | ||
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| context "many-to-many association" do | ||
| should "return :has_many association for Book#authors" do | ||
| association = ReflectOnAssociationTestModels::Book.reflect_on_association(:authors) | ||
| association.klass.should == ReflectOnAssociationTestModels::Author | ||
| association.macro.should == :has_many | ||
| association.name.should == :authors | ||
| association.options.should == {} | ||
| end | ||
| end | ||
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| context "one-to-one association" do | ||
| should "return :has_one association for Employee#desk" do | ||
| association = ReflectOnAssociationTestModels::Employee.reflect_on_association(:desk) | ||
| association.klass.should == ReflectOnAssociationTestModels::Desk | ||
| association.macro.should == :has_one | ||
| association.name.should == :desk | ||
| association.options.should == {} | ||
| end | ||
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| should "return :belongs_to association for Desk#employee" do | ||
| association = ReflectOnAssociationTestModels::Desk.reflect_on_association(:employee) | ||
| association.klass.should == ReflectOnAssociationTestModels::Employee | ||
| association.macro.should == :belongs_to | ||
| association.name.should == :employee | ||
| association.options.should == {} | ||
| end | ||
| end | ||
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| context "embeds one" do | ||
| should "return :has_one association for Body#heart" do | ||
| association = ReflectOnAssociationTestModels::Body.reflect_on_association(:heart) | ||
| association.klass.should == ReflectOnAssociationTestModels::Heart | ||
| association.macro.should == :has_one | ||
| association.name.should == :heart | ||
| association.options.should == {} | ||
| end | ||
| end | ||
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| context "embeds many" do | ||
| should "return :has_many association for Order#line_items" do | ||
| association = ReflectOnAssociationTestModels::Order.reflect_on_association(:line_items) | ||
| association.klass.should == ReflectOnAssociationTestModels::LineItem | ||
| association.macro.should == :has_many | ||
| association.name.should == :line_items | ||
| association.options.should == {} | ||
| end | ||
| end | ||
| end |