Query Multiple tables

rubyonrails-talk
1

Hi,

select * from table1 inner join table2 on table1.foreign_key = table2.foreign_key

select * from table1 inner join table2 on table1.foreign_key = table2.foreign_key join table3 on table2.foreign_key=table3.foreign_key

These are the SQL commands, I need to apply it in Rails. Kindly tell me the syntax in Rails to apply these SQL commands instead of sql_query.

2

Hi,

select * from table1 inner join table2 on table1.foreign_key = table2.foreign_key

select * from table1 inner join table2 on table1.foreign_key = table2.foreign_key join table3 on table2.foreign_key=table3.foreign_key

These are the SQL commands, I need to apply it in Rails. Kindly tell me the syntax in Rails to apply these SQL commands instead of sql_query.

Take a look at the :joins option to find (or the joins scope modifiying thing in rails 3)

Fred

3

I think has_many :through might also be what you're looking for. You can avoid writing SQL 99% of the time if you learn how to use the various flavors of ActiveRecord associations.

Jeff

4

On Sep 13, 11:59 am, PalaniKannan K kpalanikan...@gmail.com wrote:> Hi,

select * from table1 inner join table2 on table1.foreign_key =

table2.foreign_key

select * from table1 inner join table2 on table1.foreign_key =

table2.foreign_key join table3 on table2.foreign_key=table3.foreign_key

These are the SQL commands, I need to apply it in Rails. Kindly tell me the

syntax in Rails to apply these SQL commands instead of sql_query.

Take a look at the :joins option to find (or the joins scope

modifiying thing in rails 3)

Fred

I think has_many :through might also be what you’re looking for. You

can avoid writing SQL 99% of the time if you learn how to use the

various flavors of ActiveRecord associations. Dear Jeff, In model I can apply has_many and belongs_to option. How I can apply those tables in Controller and View… I am new bee… I tried with some tutorials, every tutorial i m getting instructions to use has_many and belongs_to in model. I am getting problem with controllers and view to use “find” with foreign_keys if I use those options in model.