Module: EasyModelSelects

Defined in:
lib/easy_model_selects.rb,
lib/easy_model_selects/version.rb

Constant Summary collapse

VERSION = 
"0.9.0"

Class Method Summary collapse

Class Method Details

.delete_last_and(wrong_and_at_the_end) ⇒ Object 



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# File 'lib/easy_model_selects.rb', line 75

def self.delete_last_and(wrong_and_at_the_end)
  no_and_at_the_end = wrong_and_at_the_end.from(0).to(wrong_and_at_the_end.length - 5)
end

.get_where_condition(param_name, param_value, where_condition, modifier, operator) ⇒ Object 



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# File 'lib/easy_model_selects.rb', line 71

def self.get_where_condition(param_name, param_value, where_condition, modifier, operator)
  where_condition[0] = "#{where_condition[0]}#{param_name} #{modifier} (?) #{operator} "#question
  where_condition.push "#{param_value}" #values
end

.get_where_statement(param_name, param_value, where_condition) ⇒ Object 



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# File 'lib/easy_model_selects.rb', line 15

def self.get_where_statement(param_name, param_value, where_condition)
  #some stuff to prepare everything
  modifiers = {">>"=> ">","<<"=> "<","=="=> "=","<="=> "<=",">="=> ">=", "LK"=> "LIKE", "IN"=> "IN"}
  operators = {"!and!"=>"and","!xor!"=>"or"}

  #care for easy writing
  param_name = "updated_at" if param_name == "modified_since"

  #care for operator staff
  if param_value.include? operators.keys.first#each element recommendet, but not necessary at the moment
    operatorkey = operators.keys.first
  else
    if param_value.include? operators.keys.last
      operatorkey = operators.keys.last
    else
      operatorkey = "!and!"
    end
  end

  param_value.split(operatorkey).each do |param_value_sep|
    if param_value_sep == param_value.split(operatorkey).last
      #operator to next statement needs to be and not or, or can just be between a condition for one attribute
      operatorkey = "!and!"
    end
  
    #care for modifiers
    if modifiers.key? param_value_sep[0..1]
      modifier = modifiers[param_value_sep[0..1]]
      param_value_sep = param_value_sep[2..param_value_sep.length]
    else
      modifier = "="
    end
  
    where_condition = get_where_condition(param_name, param_value_sep, where_condition, modifier, operators[operatorkey])
  end

  #care for array staff
  #if array param_value, the staff should be selected in more optimized way: (selecting every given possibility instead of just one)
  if param_value.include? "{" and param_value.include? "}"
    array_to_be_found = param_value.clone
    array_to_be_found.remove!("{","}")
  
    if !where_condition[0].nil?
      where_condition[0] = delete_last_and(where_condition[0])
      where_condition[0] = "#{where_condition[0]} or "
    end
  
    array_to_be_found.split(",").each do |array_value|
      where_condition[0] = "#{where_condition[0]}(?) = ANY (#{param_name}) or "#question
      where_condition.push "#{array_value}" #values
    end
  end

  #return
  where_condition
end

.get_where_statement_from_param(params) ⇒ Object 



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# File 'lib/easy_model_selects.rb', line 5

def self.get_where_statement_from_param(params)
  #prepare where statemant out of names and values in an array
    where_condition = []
    params.each do |param_name, param_value|
        where_condition = get_where_statement(param_name, param_value, where_condition)
    end
    where_condition[0] = delete_last_and(where_condition[0])
    where_condition
end