Simple interface

README.md

@@ -28,15 +28,16 @@ Or install it yourself as:
 
 ```ruby
 # GET /customers?q[name_eq]=Pablo&q[middle_name_or_last_name_cont]=Cantero
+
 # params[:q]
 # => { name_eq: 'Pablo', middle_name_or_last_name_cont: 'Cantero' }
-# query.to_query(params[:q])
+
+# RansackMongo::Query.parse(params[:q])
 # => { name: 'Pablo', '$or' => { middle_name: /Cantero/i, last_name: /Cantero/i } }
 
 # GET /customers
 def index
-  query = RansackMongo::Query.new
-  selector = query.to_query(params[:q])
+  selector = RansackMongo::Query.parse(params[:q])
 
   # Mongo Ruby Driver
   @customers = db.customers.find(selector)
@@ -63,20 +64,23 @@ You can also combine predicates for OR queries.
 
 ```ruby
 query_param = { name_eq: 'Pablo', middle_name_or_last_name_cont: 'Cantero' }
-query.to_query(params[:q])
+
+RansackMongo::Query.parse(params[:q])
 # => { name: 'Pablo', '$or' => { middle_name: /Cantero/i, last_name: /Cantero/i } }
 ```
 
-### to_query!
+### parse!
+
+You can use `parse!` for stricter validations. This method will raise an exception if a query cannot be produced.
 
-You can use to_query! for stricter validations. This method will raise an exception if a query cannot be produced.
 ```ruby
  # xpto isn't a valid predicate
 
-query.to_query(name_xpto: 'Pablo')
+RansackMongo::Query.parse(name_xpto: 'Pablo')
 # => {}
-query.to_query!(name_xpto: 'Pablo')
-# => RansackMongo::MatcherNotFound: No matchers found. To allow empty queries use .to_query instead
+
+RansackMongo::Query.parse!(name_xpto: 'Pablo')
+# => RansackMongo::MatcherNotFound: No matchers found. To allow empty queries use .parse instead
 ```
 
 ## Contributing

lib/ransack_mongo/query.rb

@@ -3,14 +3,11 @@ module RansackMongo
 
   # https://github.com/activerecord-hackery/ransack/wiki/Basic-Searching
   class Query
-    def initialize(db_adapter_class = MongoAdapter)
-      @db_adapter_class = db_adapter_class
-    end
-
-    def to_query(params)
-      parsed_predicates = Predicate.new(@db_adapter_class.predicates).parse(params)
+    class << self
+      def parse(params, db_adapter_class = MongoAdapter)
+        parsed_predicates = Predicate.new(db_adapter_class.predicates).parse(params)
 
-      db_adapter = @db_adapter_class.new
+        db_adapter = db_adapter_class.new
 
         parsed_predicates.keys.each do |p|
           parsed_predicates[p].each do |parsed_predicate|
@@ -26,7 +23,7 @@ module RansackMongo
                 db_adapter.send("#{p}_matcher", attr, value)
               end
             rescue NoMethodError => e
-            raise MatcherNotFound, "The matcher #{p} `#{p}_matcher` was not found in the #{@db_adapter_class.name}. Check `#{@db_adapter_class}.predicates`"
+              raise MatcherNotFound, "The matcher #{p} `#{p}_matcher` was not found in the #{db_adapter_class.name}. Check `#{db_adapter_class}.predicates`"
             end
           end
         end
@@ -34,16 +31,16 @@ module RansackMongo
         db_adapter.to_query
       end
 
-    def to_query!(params)
-      selector = to_query params
-
-      if selector.empty?
-        raise MatcherNotFound,  "No matchers found. To allow empty queries use .to_query instead"
+      def parse!(params, db_adapter_class = MongoAdapter)
+        if (selector = parse(params)).empty?
+          raise MatcherNotFound,  'No matchers found. To allow empty queries use .parse instead'
         end
 
         selector
       end
 
+      private
+
       def or_query(db_adapter, attr, value, p)
         db_adapter.or_op do
           attr.split('_or_').each do |or_attr|
@@ -52,4 +49,5 @@ module RansackMongo
         end
       end
     end
+  end
 end

spec/ransack_mongo/query_spec.rb

@@ -10,7 +10,7 @@ module RansackMongo
           @query = {}
         end
 
-        def to_query
+        def parse
           @query
         end
 
@@ -19,12 +19,12 @@ module RansackMongo
         end
       end
 
-      describe '#to_query' do
+      describe '#parse' do
         context 'when not implement matcher' do
           it 'raises proper exception' do
             params = { 'name_foo' => 'Pablo' }
             expect {
-              described_class.new(FooAdapter).to_query(params)
+              described_class.parse(params, FooAdapter)
             }.to raise_error(MatcherNotFound, 'The matcher foo `foo_matcher` was not found in the RansackMongo::FooAdapter. Check `RansackMongo::FooAdapter.predicates`')
           end
         end
@@ -32,37 +32,37 @@ module RansackMongo
     end
 
     context 'when MongoAdapter' do
-      describe '#to_query!' do
+      describe '#parse!' do
         it 'raises exception when query evaluates to an empty hash' do
           params = { 'name' => 'Pablo' }
-          expect { described_class.new.to_query!(params) }.to raise_error(MatcherNotFound)
+          expect { described_class.parse!(params) }.to raise_error(MatcherNotFound)
         end
 
         it 'returns the query' do
           params = { 'name_eq' => 'Pablo', 'fullname_cont' => 'Cantero' }
 
-          expect(described_class.new.to_query!(params)).to eq('name' => 'Pablo', 'fullname' => /Cantero/i)
+          expect(described_class.parse!(params)).to eq('name' => 'Pablo', 'fullname' => /Cantero/i)
         end
       end
 
-      describe '#to_query' do
+      describe '#parse' do
         it 'returns the query' do
           params = { 'name_eq' => 'Pablo', 'fullname_cont' => 'Cantero' }
 
-          expect(described_class.new.to_query(params)).to eq('name' => 'Pablo', 'fullname' => /Cantero/i)
+          expect(described_class.parse(params)).to eq('name' => 'Pablo', 'fullname' => /Cantero/i)
         end
 
         context 'when or' do
           it 'returns the query' do
             params = { 'name_or_fullname_eq' => 'Pablo' }
 
-            expect(described_class.new.to_query(params)).to eq('$or' => [{ 'name' => 'Pablo' }, { 'fullname' => 'Pablo' }])
+            expect(described_class.parse(params)).to eq('$or' => [{ 'name' => 'Pablo' }, { 'fullname' => 'Pablo' }])
           end
 
           it 'preserves other criterias' do
             params = { 'name_or_fullname_eq' => 'Pablo', 'country_eq' => 'Brazil' }
 
-            expect(described_class.new.to_query(params)).to eq('$or' => [{ 'name' => 'Pablo' }, { 'fullname' => 'Pablo' }], 'country' => 'Brazil')
+            expect(described_class.parse(params)).to eq('$or' => [{ 'name' => 'Pablo' }, { 'fullname' => 'Pablo' }], 'country' => 'Brazil')
           end
         end
       end