how to add records to has_many :through association in rails

how to add records to has_many :through association in rails

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Rails has_many :through Find by Extra Attributes in Join Model

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How do I order a has_many through association in Ruby on Rails?

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Ruby-on-Rails: Multiple has_many :through possible?

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dependent => destroy on a "has_many through" association

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Rails: has_many through with polymorphic association - will this work?

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Rails: HasManyThroughAssociationNotFoundError

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Rails Associations - has_many => :through - but same model

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Active Record has_many :through remove one associated record

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Validate that an object has one or more associated objects

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Rails 4 Form: has_many through: checkboxes

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how to avoid duplicates in a has_many :through relationship?

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Rails - Sort by join table data

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Rails RSpec Tests for a has_many :through Relationship

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Rails has_many :through nested form

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