Rails. how to display the data by column name - sql

Question

I use Rails 4.
I use structure
#users = ActiveRecord::Base.connection.execute("SELECT * FROM users")
#users.each do |row| %>
puts user[0] # id--> 1,2,3,4,5,6
end
#users.fields do |field| %>
puts field.name # --> id, login, password.....
end
how to display the data by column name?
for example
#users.first.field['id']

Answer 1

ActiveRecord::Base.connection.execute( will run the sql but not return anything (or return nil, more accurately). To load the records into memory do
#users = User.all
You don't describe what you want very well. If you literally want "1,2,3,4,5,6" you could do
#users.map(&:id).join(",")
if you wanted, for example, to do a table showing all the user data you could do (in your view)
<% cols = User.column_names %>
<table>
<thead>
<tr>
<% cols.each do |col| %>
<th><%= col %></th>
<% end %>
</tr>
</thead>
<tbody>
<% #users.each do |user| %>
<tr>
<% cols.each do |col| %>
<td><%= user.send(col) %></td>
<% end %>
</tr>
<% end %>
</tbody>
</table>
Like i say i don't know if this is what you actually want to do. Your requirements are a very messy and very vague.
EDIT
If you want to load data out of the database without using an AR model then you can do
#users = ActiveRecord::Base.connection.select_all("select * from users")
this will give you an array of hashes like this
[{"id" => "1", "name" => "foo", "bar" => "baz"}, {"id" => "2", "name" => "chunky", "bar" => "bacon"}, .... ]
which you could then access like
user = #users.first #you've got a hash now
aname = user["name"]