Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/from_param.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from_param(parameter) ⇒ Object

Takes a parameter generated by to_param and tried to find a matching record. If param_column is set and exists, uses that as the finder, otherwise uses the id such as in the default Rails to_param.



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# File 'lib/from_param.rb', line 27

def from_param(parameter)
  if param_column?
    send "find_by_#{param_column}", parameter
  else
    find_by_id(parameter.to_i)        
  end
end

.param_column ⇒ Object

The column that is currently set to be used with the from_param method.



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# File 'lib/from_param.rb', line 6

def param_column
  "param"
end

.param_column= ⇒ Object

The column that is currently set to be used with the from_param method.



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# File 'lib/from_param.rb', line 9

def param_column
  "param"
end

.param_column? ⇒ Boolean

Returns true if the param_column is one of the currently defined columns of your table.

Returns:

  • (Boolean) 


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# File 'lib/from_param.rb', line 19

def param_column?
  column_names.include?(param_column)
end

.param_taken?(instance) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/from_param.rb', line 65

def param_taken?(instance)
  return false if !param_column?
  conditions = instance.new_record? ? nil : ["id <> ?", instance.id]
  check_value = instance.send "#{param_column}"
  return true if instance.class.send("find_by_#{param_column}", check_value, :conditions => conditions)
  false
end

.set_param_column(val) ⇒ Object

Allows you to set the column that will be used by from_param by default.



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# File 'lib/from_param.rb', line 13

def set_param_column(val)
  define_attr_method :param_column, val
end

Instance Method Details

#param_column ⇒ Object

Calls param_column on the class



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# File 'lib/from_param.rb', line 42

def param_column
  self.class.param_column
end

#param_column? ⇒ Boolean

Calls param_column? on the class

Returns:

  • (Boolean) 


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# File 'lib/from_param.rb', line 37

def param_column?
  self.class.param_column?
end

#set_param ⇒ Object

Automatically called before saving, sets the param_column to the current to_param



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# File 'lib/from_param.rb', line 49

def set_param
  send "#{param_column}=", to_param if param_column?
  if self.class.param_taken?(self)
    i = 2
    base_value = send "#{param_column}"
    send "#{param_column}=", "#{base_value}-#{i}"
    while(self.class.param_taken?(self))
  #    base_value = send "#{param_column}"
  #    send "#{param_column}=", base_value.chop + (i+=1).to_s
  send "#{param_column}=", "#{base_value}-#{i+=1}"
    end
  end
end