mastodon/app/models/follow.rb

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class Follow < ApplicationRecord
include Streamable
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belongs_to :account
belongs_to :target_account, class_name: 'Account'
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validates :account, :target_account, presence: true
validates :account_id, uniqueness: { scope: :target_account_id }
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def verb
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destroyed? ? :unfollow : :follow
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end
def target
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target_account
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end
def object_type
:person
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end
def title
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destroyed? ? "#{account.acct} is no longer following #{target_account.acct}" : "#{account.acct} started following #{target_account.acct}"
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end
after_create :add_to_graph
after_destroy :remove_from_graph
private
def add_to_graph
neo = Neography::Rest.new
a = neo.create_unique_node('account_index', 'Account', account_id.to_s, account_id: account_id)
b = neo.create_unique_node('account_index', 'Account', target_account_id.to_s, account_id: target_account_id)
neo.create_unique_relationship('follow_index', 'Follow', id.to_s, 'follows', a, b)
rescue Neography::NeographyError => e
Rails.logger.error e
end
def remove_from_graph
neo = Neography::Rest.new
rel = neo.get_relationship_index('follow_index', 'Follow', id.to_s)
neo.delete_relationship(rel)
rescue Neography::NeographyError => e
Rails.logger.error e
end
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end