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Add as_object Liquid filter

The `as_object` returns the received data/object as is without casting it to a string like liquid normally does. It
can be used as a JSONPath replacement or to emit result of a Liquid filter chain as an array.

`catch` and `throw` needs to be used to break out of Liquid render chain. Liquid aggregates the output of every
expression an array and [joins](https://github.com/Shopify/liquid/blob/v3.0.6/lib/liquid/block.rb#L147) it together that
join makes it impossible to get anything else than a string out of a Liquid template.

Dominik Sander 9 years ago
parent
4469213425
commit
d2cbd04ac8
5 changed files with 96 additions and 9 deletions
Show Diff Stats
  1. 11 6
      app/concerns/liquid_droppable.rb
  2. 22 1
      app/concerns/liquid_interpolatable.rb
  3. 4 2
      app/models/agent.rb
  4. 4 0
      app/models/event.rb
  5. 55 0
      spec/concerns/liquid_interpolatable_spec.rb

+ 11 - 6
app/concerns/liquid_droppable.rb
View File 

@@ -18,6 +18,11 @@ module LiquidDroppable
18 18 
         yield [name, __send__(name)]
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       }
20 20 
     end
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+
22 
+    def as_json
23 
+      return {} unless defined?(self.class::METHODS)
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+      Hash[self.class::METHODS.map { |m| [m, send(m).as_json]}]
25 
+    end
21 26 
   end
22 27
23 28 
   included do
 
@@ -33,12 +38,10 @@ module LiquidDroppable
33 38 
     self.class::Drop.new(self)
34 39 
   end
35 40
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-  class MatchDataDrop < Liquid::Drop
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-    def initialize(object)
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-      @object = object
39 
-    end
41 
+  class MatchDataDrop < Drop
42 
+    METHODS = %w[pre_match post_match names size]
40 43
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-    %w[pre_match post_match names size].each { |attr|
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+    METHODS.each { |attr|
42 45 
       define_method(attr) {
43 46 
         @object.__send__(attr)
44 47 
       }
 
@@ -64,7 +67,9 @@ module LiquidDroppable
64 67 
   require 'uri'
65 68
66 69 
   class URIDrop < Drop
67 
-    URI::Generic::COMPONENT.each { |attr|
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+    METHODS = URI::Generic::COMPONENT
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+
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+    METHODS.each { |attr|
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       define_method(attr) {
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         @object.__send__(attr)
70 75 
       }

+ 22 - 1
app/concerns/liquid_interpolatable.rb
View File 

@@ -92,7 +92,9 @@ module LiquidInterpolatable
92 92
93 93 
   def interpolate_string(string, self_object = nil)
94 94 
     interpolate_with(self_object) do
95 
-      Liquid::Template.parse(string).render!(interpolation_context)
95 
+      catch :as_object do
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+        Liquid::Template.parse(string).render!(interpolation_context)
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+      end
96 98 
     end
97 99 
   end
98 100 
 
@@ -225,6 +227,25 @@ module LiquidInterpolatable
225 227 
       JSON.dump(input)
226 228 
     end
227 229
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+    # Returns a Ruby object
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+    #
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+    # It can be used as a JSONPath replacement for Agents that only support Liquid:
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+    #
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+    # Event:   {"something": {"nested": {"data": 1}}}
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+    # Liquid:  {{something.nested | as_object}}
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+    # Returns: {"data": 1}
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+    #
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+    # Splitting up a string with Liquid filters and return the Array:
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+    #
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+    # Event:   {"data": "A,B,C"}}
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+    # Liquid:  {{data | split: ',' | as_object}}
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+    # Returns: ['A', 'B', 'C']
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+    #
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+    # as_object ALWAYS has be the last filter in a Liquid expression!
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+    def as_object(object)
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+      throw :as_object, object.as_json
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+    end
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+
228 249 
     private
229 250
230 251 
     def logger

+ 4 - 2
app/models/agent.rb
View File 

@@ -443,7 +443,7 @@ class AgentDrop
443 443 
     @object.short_type
444 444 
   end
445 445
446 
-  [
446 
+  METHODS = [
447 447 
     :name,
448 448 
     :type,
449 449 
     :options,
 
@@ -456,7 +456,9 @@ class AgentDrop
456 456 
     :disabled,
457 457 
     :keep_events_for,
458 458 
     :propagate_immediately,
459 
-  ].each { |attr|
459 
+  ]
460 
+
461 
+  METHODS.each { |attr|
460 462 
     define_method(attr) {
461 463 
       @object.__send__(attr)
462 464 
     } unless method_defined?(attr)

+ 4 - 0
app/models/event.rb
View File 

@@ -119,4 +119,8 @@ class EventDrop
119 119 
   def _location_
120 120 
     @object.location
121 121 
   end
122 
+
123 
+  def as_json
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+    {location: _location_.as_json, agent: @object.agent.to_liquid.as_json, payload: @payload.as_json, created_at: created_at.as_json}
125 
+  end
122 126 
 end

+ 55 - 0
spec/concerns/liquid_interpolatable_spec.rb
View File 

@@ -264,4 +264,59 @@ describe LiquidInterpolatable::Filters do
264 264 
       expect(agent.interpolated['cleaned']).to eq('FOObar ZOObar')
265 265 
     end
266 266 
   end
267 
+
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+  context 'as_object' do
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+    let(:agent) { Agents::InterpolatableAgent.new(name: "test") }
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+
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+    it 'returns an array that was splitted in liquid tags' do
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+      agent.interpolation_context['something'] = 'test,string,abc'
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+      agent.options['array'] = "{{something | split: ',' | as_object}}"
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+      expect(agent.interpolated['array']).to eq(['test', 'string', 'abc'])
275 
+    end
276 
+
277 
+    it 'returns an object that was not modified in liquid' do
278 
+      agent.interpolation_context['something'] = {'nested' => {'abc' => 'test'}}
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+      agent.options['object'] = "{{something.nested | as_object}}"
280 
+      expect(agent.interpolated['object']).to eq({"abc" => 'test'})
281 
+    end
282 
+
283 
+    context 'as_json' do
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+      def ensure_safety(obj)
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+        JSON.parse(JSON.dump(obj))
286 
+      end
287 
+
288 
+      it 'it converts "complex" objects' do
289 
+        agent.interpolation_context['something'] = {'nested' => Service.new}
290 
+        agent.options['object'] = "{{something | as_object}}"
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+        expect(agent.interpolated['object']).to eq({'nested'=> ensure_safety(Service.new.as_json)})
292 
+      end
293 
+
294 
+      it 'works with AgentDrops' do
295 
+        agent.interpolation_context['something'] = agent
296 
+        agent.options['object'] = "{{something | as_object}}"
297 
+        expect(agent.interpolated['object']).to eq(ensure_safety(agent.to_liquid.as_json.stringify_keys))
298 
+      end
299 
+
300 
+      it 'works with EventDrops' do
301 
+        event = Event.new(payload: {some: 'payload'}, agent: agent, created_at: Time.now)
302 
+        agent.interpolation_context['something'] = event
303 
+        agent.options['object'] = "{{something | as_object}}"
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+        expect(agent.interpolated['object']).to eq(ensure_safety(event.to_liquid.as_json.stringify_keys))
305 
+      end
306 
+
307 
+      it 'works with MatchDataDrops' do
308 
+        match = "test string".match(/\A(?<word>\w+)\s(.+?)\z/)
309 
+        agent.interpolation_context['something'] = match
310 
+        agent.options['object'] = "{{something | as_object}}"
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+        expect(agent.interpolated['object']).to eq(ensure_safety(match.to_liquid.as_json.stringify_keys))
312 
+      end
313 
+
314 
+      it 'works with URIDrops' do
315 
+        uri = URI.parse("https://google.com?q=test")
316 
+        agent.interpolation_context['something'] = uri
317 
+        agent.options['object'] = "{{something | as_object}}"
318 
+        expect(agent.interpolated['object']).to eq(ensure_safety(uri.to_liquid.as_json.stringify_keys))
319 
+      end
320 
+    end
321 
+  end
267 322 
 end