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Contents
module PactBroker module Database # Returns a list of the tables in the database in the order in which # they can be truncated or dropped class TableDependencyCalculator def self.call connection new(connection).call end def initialize connection @connection = connection end def call ordered_table_names = [] dependencies = @connection .tables .collect{|it| @connection.foreign_key_list(it) .collect{|fk| {from: it, to: fk[:table]} } } .flatten .uniq - [:schema_migrations] check(@connection.tables, dependencies, ordered_table_names) ordered_table_names end def deps_on table_name, deps deps.select{ | d| d[:to] == table_name }.collect{ |d| d[:from] } end def check table_names, deps, ordered_table_names return if table_names.size == 0 remaining_dependencies = deps_on(table_names.first, deps) - ordered_table_names if remaining_dependencies.size == 0 ordered_table_names << table_names.first check(table_names[1..-1], deps, ordered_table_names) else check((remaining_dependencies + table_names).uniq, deps, ordered_table_names) end end end end end
Version data entries
1 entries across 1 versions & 1 rubygems
Version | Path |
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pact_broker-2.13.0 | tasks/database/table_dependency_calculator.rb |