41 lines
1.2 KiB
Ruby
41 lines
1.2 KiB
Ruby
module DeveloperProjectsAssociationExtension
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def find_most_recent
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find(:first, :order => "id DESC")
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end
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end
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class Developer < ActiveRecord::Base
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has_and_belongs_to_many :projects do
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def find_most_recent
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find(:first, :order => "id DESC")
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end
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end
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has_and_belongs_to_many :projects_extended_by_name,
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:class_name => "Project",
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:join_table => "developers_projects",
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:association_foreign_key => "project_id",
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:extend => DeveloperProjectsAssociationExtension
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has_and_belongs_to_many :special_projects, :join_table => 'developers_projects', :association_foreign_key => 'project_id'
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validates_inclusion_of :salary, :in => 50000..200000
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validates_length_of :name, :within => 3..20
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end
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DeveloperSalary = Struct.new(:amount)
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class DeveloperWithAggregate < ActiveRecord::Base
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self.table_name = 'developers'
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composed_of :salary, :class_name => 'DeveloperSalary', :mapping => [%w(salary amount)]
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end
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class DeveloperWithBeforeDestroyRaise < ActiveRecord::Base
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self.table_name = 'developers'
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has_and_belongs_to_many :projects, :join_table => 'developers_projects', :foreign_key => 'developer_id'
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before_destroy :raise_if_projects_empty!
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def raise_if_projects_empty!
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raise if projects.empty?
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end
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end
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