Module: Rack

Defined in:
lib/rack/core-data/version.rb,
lib/rack/core-data.rb

Defined Under Namespace

Modules: CoreData

Class Method Summary collapse

Class Method Details

.CoreData(xcdatamodel) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
 
# File 'lib/rack/core-data.rb', line 16

def self.CoreData(xcdatamodel)
  model = CoreData::DataModel.new(xcdatamodel)

  # Create each model class before implementing, in order to correctly set up relationships
  model.entities.each do |entity|
    klass = Rack::CoreData::Models.const_set(entity.name.capitalize, Class.new(Sequel::Model))
  end

  app = Class.new(Sinatra::Base) do
    use Rack::PostBodyContentTypeParser

    before do
      content_type :json
    end

    helpers Sinatra::Param
  end

  model.entities.each do |entity|
    klass = Rack::CoreData::Models.const_get(entity.name.capitalize)
    klass.dataset = entity.name.downcase.pluralize.to_sym

    klass.class_eval do
      self.strict_param_setting = false
      self.raise_on_save_failure = false

      plugin :json_serializer, naked: true, include: [:url]
      plugin :schema
      plugin :validation_helpers

      def url
        "/#{self.class.table_name}/#{self[primary_key]}"
      end

      entity.relationships.each do |relationship|
        options = {:class => Rack::CoreData::Models.const_get(relationship.destination.capitalize)}

        if relationship.to_many?
          one_to_many relationship.name.to_sym, options
        else
          many_to_one relationship.name.to_sym, options
        end
      end

      set_schema do
        primary_key :id

        entity.attributes.each do |attribute|
          next if attribute.transient?

          options = {
            :null => attribute.optional?,
            :index => attribute.indexed?,
            :default => attribute.default_value
          }

          type = case attribute.type
                  when "Integer 16" then :int2
                  when "Integer 32" then :int4
                  when "Integer 64" then :int8
                  when "Float" then :float4
                  when "Double" then :float8
                  when "Decimal" then :float8
                  when "Date" then :timestamp
                  when "Boolean" then :boolean
                  when "Binary" then :bytea
                  else :varchar
                 end

          column attribute.name.to_sym, type, options
        end

        entity.relationships.each do |relationship|
          options = {
            :index => true,
            :null => relationship.optional?
          }

          if not relationship.to_many?
            column "#{relationship.name}_id".to_sym, :integer, options
          end
        end
      end

      if table_exists?
        missing_columns = schema.columns.reject{|c| columns.include?(c[:name])}
        db.alter_table table_name do
          missing_columns.each do |options|
            add_column options.delete(:name), options.delete(:type), options
          end
        end
      else
        create_table
      end
    end

    klass.send :define_method, :validate do
      entity.attributes.each do |attribute|
        case attribute.type
          when "Integer 16", "Integer 32", "Integer 64"
            validates_integer attribute.name
          when "Float", "Double", "Decimal"
            validates_numeric attribute.name
          when "String"
            validates_min_length attribute.minimum_value, attribute.name if attribute.minimum_value
            validates_max_length attribute.maximum_value, attribute.name if attribute.maximum_value
         end
      end
    end

    app.class_eval do
      include Rack::CoreData::Models
      klass = Rack::CoreData::Models.const_get(entity.name.capitalize)

      disable :raise_errors, :show_exceptions

      get "/#{klass.table_name}/?" do
        if params[:page] or params[:per_page]
          param :page, Integer, default: 1, min: 1
          param :per_page, Integer, default: 100, in: (1..100)

          {
            "#{klass.table_name}" => klass.limit(params[:per_page], (params[:page] - 1) * params[:per_page]),
            page: params[:page],
            total: klass.count
          }.to_json
        else
          param :limit, Integer, default: 100, in: (1..100)
          param :offset, Integer, default: 0, min: 0

          {
            "#{klass.table_name}" => klass.limit(params[:limit], params[:offset])
          }.to_json
        end
      end

      post "/#{klass.table_name}/?" do
        record = klass.new(params)
        if record.save
          status 201
          {entity.name.downcase => record}.to_json
        else
          status 406
          {errors: record.errors}.to_json
        end
      end

      get "/#{klass.table_name}/:id/?" do
        record = klass[params[:id]] or halt 404
        {entity.name.downcase => record}.to_json
      end

      put "/#{klass.table_name}/:id/?" do
        record = klass[params[:id]] or halt 404
        if record.update(params)
          status 200
          {entity.name.downcase => record}.to_json
        else
          status 406
          {errors: record.errors}.to_json
        end
      end

      delete "/#{klass.table_name}/:id/?" do
        record = klass[params[:id]] or halt 404
        if record.destroy
          status 200
        else
          status 406
          {errors: record.errors}.to_json
        end
      end

      entity.relationships.each do |relationship|
        next unless relationship.to_many?

        get "/#{klass.table_name}/:id/#{relationship.name}/?" do
          {relationship.name => klass[params[:id]].send(relationship.name)}.to_json
        end
      end
    end
  end

  return app
end