Rails associations has_many :through References
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4.3.2 Options for has_many. While Rails uses intelligent defaults that will work well in ... has_many :through associations provide a way to implement many-to-many ...
guides.rubyonrails.org/association_​basics.html -
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You can also go through a has_many association on the join model: ... Note that :dependent is implemented using Rails’ callback system, ...
api.rubyonrails.org/classes/​ActiveRecord/Associations/... -
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Over the weekend I noticed that the Rails API docs didn\'t have any basic information on relation cardinality and how that maps to associations.
blog.hasmanythrough.com/...rails-​association-cardinality -
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I\'ve noticed there\'s a bit of confusion about the differences between the two ways to create many-to-many relationships using Rails associations.
blog.hasmanythrough.com/2006/4/20/many-​to-many-dance-off -
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stackoverflow.com/.../rails-​associations-has-many-through -
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stackoverflow.com/...on-rails-multiple-​has-many-through... -
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Ruby on Rails latest stable (v3.2.13) ... With has_many:through associations this option is ignored at least in versions up to 2.1.0, so even if you set : ...
apidock.com/rails/.../Associations/​ClassMethods/has_many -
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The has_many => :through association joins two models through a third, allowing additional join information to be stored in the third model. In the example from Rails ...
www.erin-lawrence.com/ruby/2012/01/has-​many-through -
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So let\'s create an example app where we have a User model which has many Groups through the Membership model: $ rails ... I have a solution for has_many associations ...
paulbarry.com/articles/2007/10/24/has_​many-through... -
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Similarly in the Rails Guides - ... has_many :through associations if I add an invalid record to an existing parent via << I get an ActiveRecord:: ...
grokbase.com/t/gg/rubyo nrails-core/​132hqp7hhr/rails-core... -
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