Dump a Model table to fixtures

 


  def self.to_fixture
   write_file(File.expand_path("test/fixtures/#{table_name}.yml", RAILS_ROOT),
     self.find(:all).inject("---\n") { |s, record|
       self.columns.inject(s+"#{record.id}:\n") { |s, c|
         s+"  #{{c.name => record.attributes[c.name]}.to_yaml[5..-1]}\n" }
   })
 end

Model Reflection Overview

We all use ActiveRecord Reflection on the fly while programming, since we declare all the relations in the model and we are considering it as obvious.
i tried to search and see if there is a way to find those reflections and to alter it in runtime.

Model.reflections

i found this collection which contains all the information about the current model reflections.
for example.

• .macro: this will return the type of the current reflection (:has_many, etc..)


• .primary_key_name: the reflection primary key


• .options: the reflection SQL join options


• etc. etc.

for example, the following code will show me all the reflections for a model named Article:

1. >> y Article.reflections.values.collect {|e| e.macro.to_s  + " => " + e.primary_key_name.to_s }  
2. ---   
3. - has_many => taggee_id  
4. - belongs_to => layout_id  
5. - has_many => article_id  
6. - has_one => subject_id  
7. - belongs_to => user_id  
8. - has_many => taggee_id  
9. => nil  

Connection Options

i found a way to get the connection parameters (other than reading database.yml) of the current database connection.

1. def connection_hash  
2.   ActiveRecord::Base.connection.instance_variable_get(:@config_options)  
3. end