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leo nike

2013-Nov-01 14:20 UTC

rails 2D array access in Helper method

Hi, I Want to simply print out 2d array elements. Method is located in
Helper module. Calling helper method from jQuery. At the moment I''m not
getting output (=> 0..3) I tried to do iterate through array via .each()
method, but it would just print en entire array, however i want to
access each element and convert it either to string or integer. can
someone point me to possible solution? thanks!

       #app/helpers/controller_helper.rb
           def get_array
              database = SQLite3::Database.open("test.db")
              result = database.execute("select * from table1")
              print_array(result)
           end

           def print_array(array)
             for i in 0..array.length
                  puts array[i][i]
             end
           end

      -------------------------------------------------------------------
     #app/views/controller/file.js.erb
       if($(''.check_box1'').is('':checked'')){
            $("#div2").html("<%= get_array%>")
       }

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Tamara Temple

2013-Nov-03 21:35 UTC

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Re: rails 2D array access in Helper method

On Nov 1, 2013, at 9:20 AM, leo nike
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Hi, I Want to simply print out 2d array elements. Method is located in
> Helper module. Calling helper method from jQuery. At the moment
I''m not
> getting output (=> 0..3) I tried to do iterate through array via .each()
> method, but it would just print en entire array, however i want to
> access each element and convert it either to string or integer. can
> someone point me to possible solution? thanks!
> 
>       #app/helpers/controller_helper.rb
>           def get_array
>              database = SQLite3::Database.open("test.db")
>              result = database.execute("select * from table1")
>              print_array(result)
>           end
> 
>           def print_array(array)
>             for i in 0..array.length
>                  puts array[i][i]
>             end
>           end
> 
>      -------------------------------------------------------------------
>     #app/views/controller/file.js.erb
>      
if($(''.check_box1'').is('':checked'')){
>            $("#div2").html("<%= get_array%>")
>       }
> 
> -- 
> Posted via http://www.ruby-forum.com/.
You don’t want to use puts in there. You want to return the value so it gets
evaluated in the erb code. puts returns nil, which means you get nothing inside
the html element.

I’m not exactly sure from that method what you want inside div2 either.

Here’s what I’d suggest:

def get_array()
  # sqlite stuff as you have it
  format_table(result)
end

def format_table(data)
  out = "<table>\n"
  out += data.map do |row|
    format_row(row)
  end.join("\n")
  out += "\n</table>\n"
end

def format_row(row)
  out = "<tr>"
  out += row.map do |cell|
    format_cell(cell)
  end.join
  out += "</tr>"
end

def format_cell(cell)
  "<td>#{cell}</td>"
end

This will output html code, which seems like what you’d want at that point.

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Tamara Temple

2013-Nov-04 09:19 UTC

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Re: rails 2D array access in Helper method

On Nov 3, 2013, at 3:35 PM, Tamara Temple
<tamouse.lists-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> On Nov 1, 2013, at 9:20 AM, leo nike
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> 
>> Hi, I Want to simply print out 2d array elements. Method is located in
>> Helper module. Calling helper method from jQuery. At the moment
I''m not
>> getting output (=> 0..3) I tried to do iterate through array via
.each()
>> method, but it would just print en entire array, however i want to
>> access each element and convert it either to string or integer. can
>> someone point me to possible solution? thanks!
>> 
>>      #app/helpers/controller_helper.rb
>>          def get_array
>>             database = SQLite3::Database.open("test.db")
>>             result = database.execute("select * from table1")
>>             print_array(result)
>>          end
>> 
>>          def print_array(array)
>>            for i in 0..array.length
>>                 puts array[i][i]
>>            end
>>          end
>> 
>>     -------------------------------------------------------------------
>>    #app/views/controller/file.js.erb
>>     
if($(''.check_box1'').is('':checked'')){
>>           $("#div2").html("<%= get_array%>")
>>      }
>> 
>> -- 
>> Posted via http://www.ruby-forum.com/.
> 
> You don’t want to use puts in there. You want to return the value so it
gets evaluated in the erb code. puts returns nil, which means you get nothing
inside the html element.
> 
> I’m not exactly sure from that method what you want inside div2 either.
> 
> Here’s what I’d suggest:
> 
> def get_array()
>  # sqlite stuff as you have it
>  format_table(result)
> end
> 
> def format_table(data)
>  out = "<table>\n"
>  out += data.map do |row|
>    format_row(row)
>  end.join("\n")
>  out += "\n</table>\n"
> end
> 
> def format_row(row)
>  out = "<tr>"
>  out += row.map do |cell|
>    format_cell(cell)
>  end.join
>  out += "</tr>"
> end
> 
> def format_cell(cell)
>  "<td>#{cell}</td>"
> end
> 
> This will output html code, which seems like what you’d want at that point.
then i decided it was too ''wet'', and refactored:

def wrap(s, tag, attr={}, &b)
  s = [s] unless s.is_a? Array
  attr = attr.empty? ? '''' : " #{attr.map{|k,v|
"#{k}=''#{v}''"}.join(" ")}"
  out = "<#{tag}#{attr}>"
  out += s.inject("") {|m,o| m+="#{block_given? ? (yield o) :
o}"}
  out += "</#{tag}>"
end


def format_table(data)
  wrap(data,"table",border: 1) do |row|
    wrap(row,"tr") do |cell|
      wrap(cell,"td")
    end
  end
end

data=[[1,2,3,4],[5,6,7,8]]

formate_table(data) # => "<table
border=''1''><tr><td>1</td><td>2</td><td>3</td><td>4</td></tr><tr><td>5</td><td>6</td><td>7</td><td>8</td></tr></table>"

(https://gist.github.com/tamouse/7300078 )

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leo nike

2013-Nov-04 14:05 UTC

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Re: rails 2D array access in Helper method

Great! I didnt even think about implementation like that, that''s 
awesome. thanks a lot! can I contact you, in case something doesnt work 
here?

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Tamara Temple

2013-Nov-04 22:50 UTC

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Re: rails 2D array access in Helper method

On Nov 4, 2013, at 8:05 AM, leo nike
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Great! I didnt even think about implementation like that, that''s 
> awesome. thanks a lot! can I contact you, in case something doesnt work 
> here?
Just reply on list, there are some truly awesome people here, most definitely
not including me.


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Tamara Temple

2013-Nov-04 22:51 UTC

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Re: rails 2D array access in Helper method

On Nov 4, 2013, at 3:19 AM, Tamara Temple
<tamouse.lists-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> On Nov 3, 2013, at 3:35 PM, Tamara Temple
<tamouse.lists-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
>> 
>> On Nov 1, 2013, at 9:20 AM, leo nike
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>> 
>>> Hi, I Want to simply print out 2d array elements. Method is located
in
>>> Helper module. Calling helper method from jQuery. At the moment
I''m not
>>> getting output (=> 0..3) I tried to do iterate through array via
.each()
>>> method, but it would just print en entire array, however i want to
>>> access each element and convert it either to string or integer. can
>>> someone point me to possible solution? thanks!
>>> 
>>>     #app/helpers/controller_helper.rb
>>>         def get_array
>>>            database = SQLite3::Database.open("test.db")
>>>            result = database.execute("select * from
table1")
>>>            print_array(result)
>>>         end
>>> 
>>>         def print_array(array)
>>>           for i in 0..array.length
>>>                puts array[i][i]
>>>           end
>>>         end
>>> 
>>>   
-------------------------------------------------------------------
>>>   #app/views/controller/file.js.erb
>>>    
if($(''.check_box1'').is('':checked'')){
>>>          $("#div2").html("<%=
get_array%>")
>>>     }
>>> 
>>> -- 
>>> Posted via http://www.ruby-forum.com/.
>> 
>> You don’t want to use puts in there. You want to return the value so it
gets evaluated in the erb code. puts returns nil, which means you get nothing
inside the html element.
>> 
>> I’m not exactly sure from that method what you want inside div2 either.
>> 
>> Here’s what I’d suggest:
>> 
>> def get_array()
>> # sqlite stuff as you have it
>> format_table(result)
>> end
>> 
>> def format_table(data)
>> out = "<table>\n"
>> out += data.map do |row|
>>   format_row(row)
>> end.join("\n")
>> out += "\n</table>\n"
>> end
>> 
>> def format_row(row)
>> out = "<tr>"
>> out += row.map do |cell|
>>   format_cell(cell)
>> end.join
>> out += "</tr>"
>> end
>> 
>> def format_cell(cell)
>> "<td>#{cell}</td>"
>> end
>> 
>> This will output html code, which seems like what you’d want at that
point.
> 
> then i decided it was too ''wet'', and refactored:
> 
> def wrap(s, tag, attr={}, &b)
>  s = [s] unless s.is_a? Array
>  attr = attr.empty? ? '''' : " #{attr.map{|k,v|
"#{k}=''#{v}''"}.join(" ")}"
>  out = "<#{tag}#{attr}>"
>  out += s.inject("") {|m,o| m+="#{block_given? ? (yield o) :
o}"}
>  out += "</#{tag}>"
> end
> 
> 
> def format_table(data)
>  wrap(data,"table",border: 1) do |row|
>    wrap(row,"tr") do |cell|
>      wrap(cell,"td")
>    end
>  end
> end
> 
> data=[[1,2,3,4],[5,6,7,8]]
> 
> formate_table(data) # => "<table
border=''1''><tr><td>1</td><td>2</td><td>3</td><td>4</td></tr><tr><td>5</td><td>6</td><td>7</td><td>8</td></tr></table>"
> 
> (https://gist.github.com/tamouse/7300078 )
> 
Listening to one of Ruby Tapas made me shake my head with pain. This:

   s = [s] unless s.is_a? Array

should be this:

  s = Array.new(s)


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leo nike

2013-Nov-06 18:08 UTC

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Re: rails 2D array access in Helper method

Hi, once again thanks for you code contribution, that helped me to see
problem from a different perspective a little bit. I liked both of your
code snippets, and 1st one in particular (since i actually understand
it)

There is only one issue though, if I try to run code below on trough
jQuery (when the checkbox is checked) it wouldnt really execute
anything.
That''s what I had problem before, and I know the problem is not with
jQuery method. I cant easily modify code to
$("#div2").html("<%= ''hello''%>") and
it would print ''hello'' in that div.
So, there is something that jQuery doesnt see in iether get_array or
format_table method. I''ve tried to merge all the 4 methods into one and
run it as one method, but it still wouldnt work. Would you please check
it one again, and let me know what could be changed?

And yes, I just want to output the result of parsed array into html
code. I dont really care how, it''s just I know only Jquery .html()
method and it seems relatively simple.

Thank you very much

def get_array()
  # sqlite stuff as you have it
  format_table(result)
end

def format_table(data)
  out = "<table>\n"
  out += data.map do |row|
    format_row(row)
  end.join("\n")
  out += "\n</table>\n"
end

def format_row(row)
  out = "<tr>"
  out += row.map do |cell|
    format_cell(cell)
  end.join
  out += "</tr>"
end

def format_cell(cell)
  "<td>#{cell}</td>"
end

----------------------------------------------------------------------
#app/views/controller/file.js.erb
       if($(''.check_box1'').is('':checked'')){
            $("#div2").html("<%= get_array%>")
       }

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Rails - Nov 2013 - rails 2D array access in Helper method

rails 2D array access in Helper method

Re: rails 2D array access in Helper method

Re: rails 2D array access in Helper method

Re: rails 2D array access in Helper method

Re: rails 2D array access in Helper method

Re: rails 2D array access in Helper method

Re: rails 2D array access in Helper method