module DynamicModel
Public Class Methods
add_table(scoped_table_name, table_prefix: :user_defined, base_class: ActiveRecord::Base, &block)
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Creates a new table with auto numbered id in the database with the name prefix provided by creating a live migration. If block is provided it will behave like create_table method for migrations, allowing to create any other column.
# File lib/database_introspection/dynamic_model.rb, line 23 def self.add_table(scoped_table_name, table_prefix: :user_defined, base_class: ActiveRecord::Base, &block) for_action_on_table(scoped_table_name, table_prefix) do |table_prefix, real_table_name| Migration::create_for "#{table_prefix}_#{real_table_name}", &block end ensure analyse_domain table_prefix, base_class end
alter_table(scoped_table_name, table_prefix: :user_defined, base_class: ActiveRecord::Base, &block)
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Modifies a table in the database with the name prefix provided by creating a live migration. If block is provided it will behave like create_table method for migrations, allowing to create any other column.
# File lib/database_introspection/dynamic_model.rb, line 35 def self.alter_table(scoped_table_name, table_prefix: :user_defined, base_class: ActiveRecord::Base, &block) raise "Missing block parameter" unless block_given? for_action_on_table(scoped_table_name, table_prefix) do |table_prefix, real_table_name| Migration::update_for "#{table_prefix}_#{real_table_name}", &block end ensure analyse_domain table_prefix, base_class end
introspect_database(table_prefix = :user_defined, base_class = ActiveRecord::Base)
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Creates ActiveRecord::Base descendants from the database. ActiveRecord descendant classes are dynamically created from database introspection in their own namespace (DynamicModel::<NameSpace>::) The name of the module NameSpace is derived from table_prefix.
# File lib/database_introspection/dynamic_model.rb, line 10 def self.introspect_database(table_prefix = :user_defined, base_class = ActiveRecord::Base) if table_prefix.class == Array table_prefix.each {|p| self.introspect_database p, base_class} return end table_prefix = table_prefix.to_s analyse_domain table_prefix, base_class end
Private Class Methods
analyse_domain(table_prefix, base_class)
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# File lib/database_introspection/dynamic_model.rb, line 54 def self.analyse_domain(table_prefix, base_class) # Confines Activerecord classes into a module named from table_prefix @domain_analyser[table_prefix] ||= DynamicModel::TablesAnalyser.new table_prefix, base_class raise "You cannot change the base class for a domain" unless @domain_analyser[table_prefix].base_class == base_class klasses = @domain_analyser[table_prefix].scan_database relation_analyser = RelationsAnalyser.new klasses relation_analyser.run end
for_action_on_table(scoped_table_name, table_prefix) { |table_prefix, real_table_name| ... }
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# File lib/database_introspection/dynamic_model.rb, line 46 def self.for_action_on_table(scoped_table_name, table_prefix) raise "Missing block parameter" unless block_given? scoped_table_name = scoped_table_name.to_s table_prefix = table_prefix.to_s real_table_name = scoped_table_name.underscore.pluralize yield table_prefix, real_table_name end