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Diffstat (limited to 'guides/source/active_record_basics.md')
| -rw-r--r-- | guides/source/active_record_basics.md | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/guides/source/active_record_basics.md b/guides/source/active_record_basics.md index 9be9c6c7b7..859679d53a 100644 --- a/guides/source/active_record_basics.md +++ b/guides/source/active_record_basics.md @@ -45,6 +45,8 @@ relationships of the objects in an application can be easily stored and retrieved from a database without writing SQL statements directly and with less overall database access code. +NOTE: If you are not familiar enough with relational database management systems (rDBMS) or structured query language (SQL), please go through [this tutorial](https://www.w3schools.com/sql/default.asp) (or [this one](http://www.sqlcourse.com/)) or study them by other means. Understanding how relational databases work is crucial to understanding Active Records and Rails in general. + ### Active Record as an ORM Framework Active Record gives us several mechanisms, the most important being the ability @@ -142,7 +144,7 @@ end This will create a `Product` model, mapped to a `products` table at the database. By doing this you'll also have the ability to map the columns of each row in that table with the attributes of the instances of your model. Suppose -that the `products` table was created using an SQL statement like: +that the `products` table was created using a SQL (or one of its extensions) statement like: ```sql CREATE TABLE products ( @@ -152,8 +154,9 @@ CREATE TABLE products ( ); ``` -Following the table schema above, you would be able to write code like the -following: +Schema above declares a table with two columns: `id` and `name`. Each row of +this table represents a certain product with these two parameters. Thus, you +would be able to write code like the following: ```ruby p = Product.new |