I'm new to ruby on rails. Now I trying to use an existing postgresql db to build a RoR site. When I type

> 
> rake db:schema:dump
> 
> 
> 

I got a file Schema.rb

```
ActiveRecord::Schema.define(version: 0) do

# These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "store", force: :cascade do |t|
    t.string "name"
    t.string "tel"
    t.string "addr"
    t.string "city"
  end

end

```

The table has attribute of

```
id:int (primary key)
name:varchar
tel:varchar
addr:varchar
city:varchar

```

How can I use Schema.rb to build a model for inserting or deleting data?