How can i know type of attribute with active record

Rails
1

Hello,

In my database, I have a table “products” with attributes :

  • id
  • title ->string
  • desc -> text

I use active record, but I don’t know why recover the type of this
attribute with active record?

I try attributes_before_type_cast but I don’t see the type

Can you help me?

Excuse for my english (I’am a young student french)

2

Richard Vincent wrote:

I try attributes_before_type_cast but I don’t see the type

Can you help me?

Excuse for my english (I’am a young student french)

Either of these should get you what you want.

MyClass.columns_hash[‘column_name’].type

@instance_of_my_class.column_for_attribute(:column_name).type

Although, I should mention that in nearly two years of developing in
Rails professionally, I don’t think I’ve ever needed to retrieve this
information in any of my apps. Are you sure that what you really want
isn’t the ruby class of the value (eg. @instance.column_name.class ),
or something else?

–
http://www.5valleys.com/
http://www.workingwithrails.com/person/8078

3

Ok thanks for your example, it’s goog for my app

Other question :
In my database, I have a table “line_items” with attributes :

  • id → integer
  • product_id → integer
    and I have a foreign key (product-id references table product)

It is possible to recover the class of attribute product_id?
In my app I list object in my database (like phpMyAdmin) and if a
foreign key I want to link to the object reference by this foreign key.

For example, in “line_items”, list object of this table and I want a
link in “product_id” to this product

I don’t know if it’s possible???

Jon G. wrote:

Richard Vincent wrote:

I try attributes_before_type_cast but I don’t see the type

Can you help me?

Excuse for my english (I’am a young student french)

Either of these should get you what you want.

MyClass.columns_hash[‘column_name’].type

@instance_of_my_class.column_for_attribute(:column_name).type

Although, I should mention that in nearly two years of developing in
Rails professionally, I don’t think I’ve ever needed to retrieve this
information in any of my apps. Are you sure that what you really want
isn’t the ruby class of the value (eg. @instance.column_name.class ),
or something else?

–
http://www.5valleys.com/
http://www.workingwithrails.com/person/8078