Class: Searchlogic::Search

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

Overview

A class that acts like a model, creates attr_accessors for named_scopes, and then chains together everything when an “action” method is called. It basically makes implementing search forms in your application effortless:

search = User.search
search.username_like = "bjohnson"
search.all

Is equivalent to:

User.search(:username_like => "bjohnson").all

Is equivalent to:

User.username_like("bjohnson").all

Defined Under Namespace

Modules: Implementation Classes: UnknownConditionError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, current_scope, conditions = {}) ⇒ Search

Creates a new search object for the given class. Ex:

Searchlogic::Search.new(User, {}, {:username_like => "bjohnson"})



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# File 'lib/searchlogic/search.rb', line 47

def initialize(klass, current_scope, conditions = {})
  self.klass = klass
  self.current_scope = current_scope
  self.conditions = conditions if conditions.is_a?(Hash)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object (private) 



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# File 'lib/searchlogic/search.rb', line 81

def method_missing(name, *args, &block)
  if name.to_s =~ /(\w+)=$/
    condition = $1.to_sym
    scope_name = normalize_scope_name($1)
    if scope?(scope_name)
      conditions[condition] = type_cast(args.first, cast_type(scope_name))
    else
      raise UnknownConditionError.new(name)
    end
  elsif scope?(normalize_scope_name(name))
    if args.size > 0
      send("#{name}=", *args)
      self
    else
      conditions[name]
    end
  else
    scope = conditions.inject(klass.scoped(current_scope)) do |scope, condition|
      scope_name, value = condition
      scope_name = normalize_scope_name(scope_name)
      klass.send(scope_name, value) if !klass.respond_to?(scope_name)
      arity = klass.named_scope_arity(scope_name)
      
      if !arity || arity == 0
        if value == true
          scope.send(scope_name)
        else
          scope
        end
      else
        scope.send(scope_name, value)
      end
    end
    scope.send(name, *args, &block)
  end
end

Instance Attribute Details

#conditions ⇒ Object

Returns a hash of the current conditions set.



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# File 'lib/searchlogic/search.rb', line 58

def conditions
  @conditions
end

#current_scope ⇒ Object

Returns the value of attribute current_scope.



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# File 'lib/searchlogic/search.rb', line 41

def current_scope
  @current_scope
end

#klass ⇒ Object

Returns the value of attribute klass.



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# File 'lib/searchlogic/search.rb', line 41

def klass
  @klass
end

Instance Method Details

#clone ⇒ Object 



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# File 'lib/searchlogic/search.rb', line 53

def clone
  self.class.new(klass, current_scope && current_scope.clone, conditions.clone)
end

#delete(*names) ⇒ Object

Delete a condition from the search. Since conditions map to named scopes, if a named scope accepts a parameter there is no way to actually delete the scope if you do not want it anymore. A nil value might be meaningful to that scope.



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# File 'lib/searchlogic/search.rb', line 75

def delete(*names)
  names.each { |name| @conditions.delete(name.to_sym) }
  self
end