How do I write this has_many_to_many dependency? - ruby-on-rails

Question

I am trying to create a has many to many relationship between a Goal model. A goal can have dependent goals and a goal can have others goals that rely on it.
So far I have come up with the below, but it does not seem to be working.
class Goal < ActiveRecord::Base
belongs_to :goal_status
belongs_to :goal_type
has_many :users, through: :user_goals
has_many :user_goals
has_many :dependers, class_name: 'GoalDependency', foreign_key: :dependee_id
has_many :dependees, class_name: 'GoalDependency', foreign_key: :depender_id
has_many :dependencies, through: :dependees
has_many :depending, through: :dependers
validates_presence_of :goal_status_id, :goal_type_id
end
class GoalDependency < ActiveRecord::Base
belongs_to :dependee, class_name: 'Goal', foreign_key: 'dependee_id'
belongs_to :depender, class_name: 'Goal', foreign_key: 'depender_id'
end
Schema
create_table "goal_dependencies", force: :cascade do |t|
t.integer "dependee_id"
t.integer "depender_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "goals", force: :cascade do |t|
t.integer "goal_status_id"
t.integer "goal_type_id"
t.string "description"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
I am getting the error
Could not find the source association(s) "dependency" or :dependencies in model GoalDependency. Try 'has_many :dependencies, :through => :dependees, :source => <name>'. Is it one of dependee or depender?
I have tried putting in a couple of different values as the source, but nothing is working. I am not really familiar that much with using source.
I would guess this is possible in rails. Any ideas?

Answer 1

After taking #Pavan's advice I changed the language around and managed to get it working that way. See the code below.
class Goal < ActiveRecord::Base
belongs_to :goal_status
belongs_to :goal_type
has_many :users, through: :user_goals
has_many :user_goals
has_many :parent_goals, class_name: 'GoalDependency', foreign_key: :parent_id
has_many :child_goals, class_name: 'GoalDependency', foreign_key: :child_id
has_many :children, through: :child_goals
has_many :parents, through: :parent_goals
validates_presence_of :goal_status_id, :goal_type_id
end
class GoalDependency < ActiveRecord::Base
belongs_to :parent, class_name: 'Goal', foreign_key: 'parent_id'
belongs_to :child, class_name: 'Goal', foreign_key: 'child_id'
end
Schema
create_table "goals", force: :cascade do |t|
t.integer "goal_status_id"
t.integer "goal_type_id"
t.string "description"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "goal_dependencies", force: :cascade do |t|
t.integer "parent_id"
t.integer "child_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end