Merge pull request #1757 from linchus/master

Add json field datatype

lib/rails_admin/config/fields/types/all.rb

@@ -26,3 +26,4 @@
 require 'rails_admin/config/fields/types/ck_editor'
 require 'rails_admin/config/fields/types/code_mirror'
 require 'rails_admin/config/fields/types/wysihtml5'
+require 'rails_admin/config/fields/types/json'

lib/rails_admin/config/fields/types/json.rb

@@ -0,0 +1,24 @@
+require 'rails_admin/config/fields/types/text'
+
+module RailsAdmin
+  module Config
+    module Fields
+      module Types
+        class Json < RailsAdmin::Config::Fields::Types::Text
+          # Register field type for the type loader
+          RailsAdmin::Config::Fields::Types.register(self)
+
+          register_instance_option :formatted_value do
+            value.present? ? JSON.pretty_generate(value) : nil
+          end
+
+          def parse_input(params)
+            if params[name].is_a?(::String)
+              params[name] = (params[name].blank? ? nil : JSON.parse(params[name]))
+            end
+          end
+        end
+      end
+    end
+  end
+end

spec/rails_admin/config/fields/types/json_spec.rb

@@ -0,0 +1,24 @@
+require 'spec_helper'
+
+describe RailsAdmin::Config::Fields::Types::Json do
+  describe '#parse_input' do
+    let(:field) { RailsAdmin.config(FieldTest).fields.detect { |f| f.name == :json_field } }
+    before :each do
+      RailsAdmin.config do |config|
+        config.model FieldTest do
+          field :json_field, :json
+        end
+      end
+    end
+
+    it 'parse valid json string' do
+      data = {string: 'string', integer: 1, array: [1, 2, 3], object: {bla: 'foo'}}.as_json
+      expect(field.parse_input(json_field: data.to_json)).to eq data
+    end
+
+    it 'raise JSON::ParserError with invalid json string' do
+      expect { field.parse_input(json_field: '{{') }.to raise_error(JSON::ParserError)
+    end
+
+  end
+end