Ruby on Rails

Association

Auto-generated methods

Singular associations (one-to-one)

| | belongs_to |
generated methods | belongs_to | :polymorphic | has_one
----------------------------------+------------+--------------+---------
#other | X | X | X
#other=(other) | X | X | X
#build_other(attributes={}) | X | | X
#create_other(attributes={}) | X | | X
#other.create!(attributes={}) | | | X
#other.nil? | X | X |
Collection associations (one-to-many / many-to-many)

| | | has_many
generated methods | habtm | has_many | :through
----------------------------------+-------+----------+----------
#others | X | X | X
#others=(other,other,...) | X | X | X
#other_ids | X | X | X
#other_ids=(id,id,...) | X | X | X
#others<< | X | X | X
#others.push | X | X | X
#others.concat | X | X | X
#others.build(attributes={}) | X | X | X
#others.create(attributes={}) | X | X | X
#others.create!(attributes={}) | X | X | X
#others.size | X | X | X
#others.length | X | X | X
#others.count | X | X | X
#others.sum(args*,&block) | X | X | X
#others.empty? | X | X | X
#others.clear | X | X | X
#others.delete(other,other,...) | X | X | X
#others.delete_all | X | X |
#others.destroy_all | X | X | X
#others.find(*args) | X | X | X
#others.find_first | X | |
#others.uniq | X | X | X
#others.reset | X | X | X