Cannot modify association because the source reflection class is associated to via :has_many + rails 3.0.10

问题

Getting Following Error ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection in ProjectController#create

Cannot modify association 'ProjectMaster#tag_masters' because the source reflection class 'TagMaster' is associated to 'ProjectTag' via :has_many.

Following are my models.

class ProjectTag < ActiveRecord::Base
  has_many :tag_masters
  has_many :project_masters
end

class TagMaster < ActiveRecord::Base
  has_many :project_tags
  has_many :project_masters, :through => :project_tags  
end

class ProjectMaster < ActiveRecord::Base
  has_many :project_tags
  has_many :tag_masters, :through => :project_tags
  # Some more code and associations here..
end

I am new to rails and tried to solve it but I don't think i can change my associations.

I am using rails 3.0.10

Please help me out here.

• Thanks

回答1:

I think my associations were wrong.

class ProjectTag < ActiveRecord::Base
  has_many :tag_masters 
  has_many :project_masters 
end

instead of has_many; I had to use belongs_to.

来源：https://stackoverflow.com/questions/8489325/cannot-modify-association-because-the-source-reflection-class-is-associated-to-v