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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:
# Keys in mysql are limited to 191 characters, due to this no adapter can
# use a longer key
KEY_LIMIT = 191
class << self
def primary_key
"key"
end
def table_name
"#{table_name_prefix}#{ActiveRecord::Base.internal_metadata_table_name}#{table_name_suffix}"
end
def index_name
"#{table_name_prefix}unique_#{ActiveRecord::Base.internal_metadata_table_name}#{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
# Creates an internal metadata table with columns +key+ and +value+
def create_table
unless table_exists?
connection.create_table(table_name, id: false) do |t|
t.column :key, :string, null: false, limit: KEY_LIMIT
t.column :value, :string
t.index :key, unique: true, name: index_name
t.timestamps
end
end
end
end
end
end
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