Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like QueryBuilderTrait often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use QueryBuilderTrait, and based on these observations, apply Extract Interface, too.
1 | <?php |
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8 | trait QueryBuilderTrait |
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9 | { |
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10 | /** |
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11 | * @var |
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12 | */ |
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13 | protected $options = []; |
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14 | |||
15 | /** |
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16 | * @var |
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17 | */ |
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18 | protected $where = []; |
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19 | |||
20 | /** |
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21 | * @var |
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22 | */ |
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23 | protected $properties = []; |
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24 | |||
25 | /** |
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26 | * @var |
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27 | */ |
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28 | protected $isLazyCollection = false; |
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29 | |||
30 | /** |
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31 | * @var |
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32 | */ |
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33 | protected $isCollection = true; |
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34 | |||
35 | /** |
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36 | * @var |
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37 | */ |
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38 | protected $isOriginal = false; |
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39 | |||
40 | /** |
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41 | * Retrieve all Items. |
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42 | * |
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43 | * @param array $options |
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44 | * |
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45 | * @return array |
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46 | */ |
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47 | protected function all($options = []) |
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60 | |||
61 | /** |
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62 | * Retrieve single Item. |
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63 | * |
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64 | * @param int $id |
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65 | * @param array $options |
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66 | * |
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67 | * @return object |
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68 | */ |
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69 | protected function find($id, $options = []) |
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81 | |||
82 | /** |
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83 | * Create new Item. |
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84 | * |
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85 | * @param array $data |
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86 | * |
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87 | * @return object |
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88 | */ |
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89 | protected function create($data) |
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101 | |||
102 | /** |
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103 | * Update Existing Item. |
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104 | * |
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105 | * @param int $id |
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106 | * @param array $data |
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107 | * |
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108 | * @return object |
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109 | */ |
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110 | View Code Duplication | protected function update($id, $data) |
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122 | |||
123 | /** |
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124 | * Destroy Item. |
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125 | * |
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126 | * @param int $id |
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127 | * @param array $options |
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128 | * |
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129 | * @return object |
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130 | */ |
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131 | protected function delete($id, $options = []) |
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143 | |||
144 | /** |
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145 | * Batch Update. |
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146 | * |
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147 | * @param array $data |
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148 | * |
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149 | * @return object |
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150 | */ |
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151 | View Code Duplication | protected function batch($data) |
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163 | |||
164 | /** |
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165 | * Retrieve data. |
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166 | * |
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167 | * @return array |
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168 | */ |
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169 | View Code Duplication | protected function get() |
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181 | |||
182 | /** |
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183 | * Retrieve data. |
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184 | * |
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185 | * @return object |
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186 | */ |
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187 | protected function first() |
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200 | |||
201 | /** |
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202 | * Set original. |
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203 | * |
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204 | * @return object $this |
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205 | */ |
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206 | View Code Duplication | protected function withOriginal() |
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214 | |||
215 | /** |
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216 | * Set collection. |
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217 | * |
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218 | * @return object $this |
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219 | */ |
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220 | View Code Duplication | protected function withCollection() |
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228 | |||
229 | /** |
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230 | * Set lazy collection. |
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231 | * |
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232 | * @return object $this |
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233 | */ |
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234 | View Code Duplication | protected function withLazyCollection() |
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242 | |||
243 | /** |
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244 | * Set options for woocommerce request. |
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245 | * |
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246 | * @param array $parameters |
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247 | * |
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248 | * @return object $this |
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249 | */ |
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250 | protected function options($parameters) |
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266 | |||
267 | /** |
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268 | * Join options for woocommerce request. |
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269 | * |
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270 | * @param array $parameters |
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271 | * |
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272 | * @return object $this |
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273 | */ |
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274 | protected function where(...$parameters) |
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293 | |||
294 | /** |
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295 | * Set order direction. |
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296 | * |
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297 | * @param string $name |
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298 | * @param string $direction |
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299 | * |
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300 | * @return object $this |
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301 | */ |
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302 | protected function orderBy($name, $direction = 'desc') |
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309 | |||
310 | /** |
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311 | * Paginate results. |
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312 | * |
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313 | * @param int $per_page |
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314 | * @param int $current_page |
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315 | * @param array $options |
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316 | * |
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317 | * @return array |
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318 | */ |
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319 | protected function paginate($per_page = 10, $current_page = 1, $options = []) |
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365 | |||
366 | /** |
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367 | * Count all results. |
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368 | * |
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369 | * @return int |
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370 | */ |
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371 | protected function count() |
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382 | |||
383 | /** |
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384 | * Store data. |
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385 | * |
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386 | * @return array |
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387 | */ |
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388 | View Code Duplication | public function save() |
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402 | } |
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403 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: