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require 'active_record/scoping/default'
require 'active_record/scoping/named'
module ActiveRecord
# This class is used to create a table that keeps track of values and keys such
# as which environment migrations were run in.
class InternalMetadata < ActiveRecord::Base # :nodoc:
class << self
def primary_key
"key"
end
def table_name
"#{table_name_prefix}#{ActiveRecord::Base.internal_metadata_table_name}#{table_name_suffix}"
end
def original_table_name
"#{table_name_prefix}active_record_internal_metadatas#{table_name_suffix}"
end
def []=(key, value)
first_or_initialize(key: key).update_attributes!(value: value)
end
def [](key)
where(key: key).pluck(:value).first
end
def table_exists?
ActiveSupport::Deprecation.silence { connection.table_exists?(table_name) }
end
def original_table_exists?
# This method will be removed in Rails 5.1
# Since it is only necessary when `active_record_internal_metadatas` could exist
ActiveSupport::Deprecation.silence { connection.table_exists?(original_table_name) }
end
# Creates an internal metadata table with columns +key+ and +value+
def create_table
if original_table_exists?
connection.rename_table(original_table_name, table_name)
end
unless table_exists?
key_options = connection.internal_string_options_for_primary_key
connection.create_table(table_name, id: false) do |t|
t.string :key, key_options
t.string :value
t.timestamps
end
end
end
end
end
end
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