Class: BazaModels::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/baza_models/query.rb

Defined Under Namespace

Classes: Inspector, Not

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ Query

Returns a new instance of Query.



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
 
# File 'lib/baza_models/query.rb', line 11

def initialize(args)
  @args = args
  @model = @args[:model]
  @db = @model.db

  raise "No database?" unless @db

  @selects = args[:selects] || []
  @wheres = args[:wheres] || []
  @includes = args[:includes] || []
  @joins = args[:joins] || []
  @groups = args[:groups] || []
  @orders = args[:orders] || []
  @limit = args[:limit]

  @joins_tracker = {}
end

Instance Attribute Details

#_previous_model ⇒ Object

Returns the value of attribute _previous_model.



9
10
11
 
# File 'lib/baza_models/query.rb', line 9

def _previous_model
  @_previous_model
end

#_relation ⇒ Object

Returns the value of attribute _relation.



9
10
11
 
# File 'lib/baza_models/query.rb', line 9

def _relation
  @_relation
end

Instance Method Details

#<<(model) ⇒ Object 



352
353
354
355
356
357
358
359
360
361
362
363
 
# File 'lib/baza_models/query.rb', line 352

def <<(model)
  raise "No previous model set" unless @_previous_model
  raise "No relation" unless @_relation

  if model.persisted?
    model.update_attributes!(@_relation.fetch(:foreign_key) => @_previous_model.id)
  else
    autoloaded_cache_or_create << model
  end

  self
end

#<=(_other) ⇒ Object 



370
371
372
 
# File 'lib/baza_models/query.rb', line 370

def <=(_other)
  false
end

#accessible_by(ability, action = :index) ⇒ Object

CanCan supports



366
367
368
 
# File 'lib/baza_models/query.rb', line 366

def accessible_by(ability, action = :index)
  ability.model_adapter(self, action).database_records
end

#all ⇒ Object 



29
30
31
 
# File 'lib/baza_models/query.rb', line 29

def all
  self
end

#any? ⇒ Boolean

Returns:

  • (Boolean) 


33
34
35
36
37
38
39
 
# File 'lib/baza_models/query.rb', line 33

def any?
  if @db.query(clone.select(:id).limit(1).to_sql).fetch
    return true
  else
    return false
  end
end

#count ⇒ Object 



49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/baza_models/query.rb', line 49

def count
  if @_previous_model && @_previous_model.new_record?
    return autoloaded_cache_or_create.length
  else
    query = clone

    query.instance_variable_set(:@selects, [])
    query = clone.select("COUNT(*) AS count")

    @db.query(query.to_sql).fetch.fetch(:count)
  end
end

#destroy_all ⇒ Object 



340
341
342
 
# File 'lib/baza_models/query.rb', line 340

def destroy_all
  each(&:destroy!)
end

#each ⇒ Object 



223
224
225
226
227
 
# File 'lib/baza_models/query.rb', line 223

def each
  to_enum.each do |model|
    yield model
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


41
42
43
 
# File 'lib/baza_models/query.rb', line 41

def empty?
  !any?
end

#find(id) ⇒ Object 



66
67
68
 
# File 'lib/baza_models/query.rb', line 66

def find(id)
  clone.where(id: id).limit(1).to_enum.first
end

#find_each ⇒ Object 



229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
 
# File 'lib/baza_models/query.rb', line 229

def find_each
  query = clone
  query.instance_variable_set(:@order, [])
  query.instance_variable_set(:@limit, nil)
  query = query.order(:id)

  offset = 0

  loop do
    query = query.offset(offset, 1000)
    offset += 1000

    count = 0
    query.each do |model|
      yield model
      count += 1
    end

    break if count == 0
  end
end

#find_first(args) ⇒ Object 



251
252
253
 
# File 'lib/baza_models/query.rb', line 251

def find_first(args)
  where(args).first
end

#first ⇒ Object 



70
71
72
73
74
75
76
77
78
79
 
# File 'lib/baza_models/query.rb', line 70

def first
  return autoloaded_cache.first if should_use_autoload?

  query = clone.limit(1)

  orders = query.instance_variable_get(:@orders)
  query = query.order(:id) if orders.empty?

  query.to_enum.first
end

#group(name) ⇒ Object 



167
168
169
170
171
172
173
174
175
176
177
 
# File 'lib/baza_models/query.rb', line 167

def group(name)
  if name.is_a?(Symbol)
    @groups << "`#{@model.table_name}`.`#{name}`"
  elsif name.is_a?(String)
    @groups << name
  else
    raise "Didn't know how to group by that argument: #{name}"
  end

  self
end

#includes(name) ⇒ Object 



112
113
114
115
 
# File 'lib/baza_models/query.rb', line 112

def includes(name)
  @includes << name
  self
end

#inspect ⇒ Object 



348
349
350
 
# File 'lib/baza_models/query.rb', line 348

def inspect
  to_s
end

#joins(*arguments) ⇒ Object 



155
156
157
158
159
160
161
162
163
164
165
 
# File 'lib/baza_models/query.rb', line 155

def joins(*arguments)
  BazaModels::Query::Inspector.new(
    query: self,
    model: @model,
    argument: arguments,
    joins: @joins,
    joins_tracker: @joins_tracker
  ).execute

  self
end

#last ⇒ Object 



81
82
83
84
85
86
87
88
89
90
 
# File 'lib/baza_models/query.rb', line 81

def last
  return autoloaded_cache.last if should_use_autoload?

  query = clone.limit(1)

  orders = query.instance_variable_get(:@orders)
  query = query.order(:id) if orders.empty?

  query.reverse_order.to_enum.first
end

#length ⇒ Object 



62
63
64
 
# File 'lib/baza_models/query.rb', line 62

def length
  count
end

#limit(limit) ⇒ Object 



107
108
109
110
 
# File 'lib/baza_models/query.rb', line 107

def limit(limit)
  @limit = limit
  self
end

#none? ⇒ Boolean

Returns:

  • (Boolean) 


45
46
47
 
# File 'lib/baza_models/query.rb', line 45

def none?
  !any?
end

#offset(offset) ⇒ Object 



102
103
104
105
 
# File 'lib/baza_models/query.rb', line 102

def offset(offset)
  @offset = offset
  self
end

#order(name) ⇒ Object 



179
180
181
182
183
184
185
186
187
188
189
 
# File 'lib/baza_models/query.rb', line 179

def order(name)
  if name.is_a?(Symbol)
    @orders << "`#{@model.table_name}`.`#{name}`"
  elsif name.is_a?(String)
    @orders << name
  else
    raise "Didn't know how to order by that argument: #{name}"
  end

  self
end

#page(some_page) ⇒ Object 



379
380
381
382
383
384
 
# File 'lib/baza_models/query.rb', line 379

def page(some_page)
  some_page ||= 1
  offset = (some_page.to_i - 1) * per

  clone.offset(offset).limit(30)
end

#per ⇒ Object 



386
387
388
 
# File 'lib/baza_models/query.rb', line 386

def per
  @per ||= 30
end

#reverse_order ⇒ Object 



191
192
193
194
 
# File 'lib/baza_models/query.rb', line 191

def reverse_order
  @reverse_order = true
  self
end

#sanitize_sql(value) ⇒ Object 



374
375
376
377
 
# File 'lib/baza_models/query.rb', line 374

def sanitize_sql(value)
  return value if value.is_a?(Array) || value.is_a?(Integer) || value.is_a?(Integer)
  "'#{@db.esc(value)}'"
end

#select(select) ⇒ Object 



92
93
94
95
96
97
98
99
100
 
# File 'lib/baza_models/query.rb', line 92

def select(select)
  if select.is_a?(Symbol)
    @selects << "`#{@model.table_name}`.`#{select}`"
  else
    @selects << select
  end

  self
end

#to_a ⇒ Object 



255
256
257
 
# File 'lib/baza_models/query.rb', line 255

def to_a
  to_enum.to_a
end

#to_enum ⇒ Object 



196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
 
# File 'lib/baza_models/query.rb', line 196

def to_enum
  return autoloaded_cache if should_use_autoload?

  array_enum = ArrayEnumerator.new do |yielder|
    @db.query(to_sql).each do |data|
      yielder << @model.new(data, init: true)
    end
  end

  if @includes.empty?
    return array_enum
  else
    array = array_enum.to_a

    if @includes.any? && array.any?
      autoloader = BazaModels::Autoloader.new(
        models: array,
        autoloads: @includes,
        db: @db
      )
      autoloader.autoload
    end

    return array
  end
end

#to_s ⇒ Object 



344
345
346
 
# File 'lib/baza_models/query.rb', line 344

def to_s
  "#<BazaModels::Query class=#{@model.name} wheres=#{@wheres}>"
end

#to_sql ⇒ Object 



259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
 
# File 'lib/baza_models/query.rb', line 259

def to_sql
  sql = "SELECT "

  if @selects.empty?
    sql << "`#{@model.table_name}`.*"
  else
    sql << @selects.join(", ")
  end

  sql << " FROM `#{@model.table_name}`"

  unless @joins.empty?
    @joins.each do |join|
      sql << " #{join}"
    end
  end

  unless @wheres.empty?
    sql << " WHERE "

    first = true
    @wheres.each do |where|
      if first == true
        first = false
      else
        sql << " AND "
      end

      sql << where
    end
  end

  unless @groups.empty?
    sql << " GROUP BY "

    first = true
    @groups.each do |group|
      if first
        first = false
      else
        sql << ", "
      end

      sql << group
    end
  end

  unless @orders.empty?
    sql << " ORDER BY "

    first = true
    @orders.each do |order|
      if first
        first = false
      else
        sql << ", "
      end

      if @reverse_order
        if order.match(/\s+desc/i)
          order = order.gsub(/\s+desc/i, " ASC")
        elsif order.match(/\s+asc/i)
          order = order.gsub(/\s+asc/i, " DESC")
        else
          order = "#{order} DESC"
        end
      end

      sql << order
    end
  end

  if @limit && @offset
    sql << " LIMIT #{@offset.to_i}, #{@limit.to_i}"
  elsif @limit
    sql << " LIMIT #{@limit.to_i}"
  end

  sql.strip
end

#total_pages ⇒ Object 



390
391
392
393
394
395
396
 
# File 'lib/baza_models/query.rb', line 390

def total_pages
  pages_count = (count.to_f / @per.to_f)
  pages_count = 1 if pages_count.nan? || pages_count == Float::INFINITY
  pages_count = pages_count.to_i
  pages_count = 1 if pages_count == 0
  pages_count
end

#where(args = nil) ⇒ Object 



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
 
# File 'lib/baza_models/query.rb', line 117

def where(args = nil)
  if args.is_a?(String)
    @wheres << "(#{args})"
  elsif args.is_a?(Array)
    str = args.shift

    args.each do |arg|
      if arg.is_a?(Symbol)
        arg = "`#{@model.table_name}`.`#{@db.escape_column(arg)}`"
      elsif arg.is_a?(FalseClass)
        arg = "0"
      elsif arg.is_a?(TrueClass)
        arg = "1"
      else
        arg = "'#{@db.esc(arg)}'"
      end

      str.sub!("?", arg)
    end

    @wheres << "(#{str})"
  elsif args == nil
    return Not.new(query: self)
  else
    args.each do |key, value|
      if value.is_a?(Hash)
        value.each do |hash_key, hash_value|
          @wheres << "`#{key}`.`#{hash_key}` = '#{@db.esc(hash_value)}'"
        end
      else
        @wheres << "`#{@model.table_name}`.`#{key}` = '#{@db.esc(value)}'"
      end
    end
  end

  self
end