1 | 'use strict';
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2 | function Relationship(config) {
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3 | this.ORM = config.ORM;
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4 | this.type = config.type;
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5 | this.modelFactoryName = config.modelFactoryName;
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6 |
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7 | if(!config.throughTableName) {
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8 | this.identifer = {
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9 | parent: config.parentIdentifer,
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10 | child: config.childIdentifer,
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11 | };
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12 | } else {
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13 | this.identifer = {
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14 | parent_0: config.parentIdentifer_0,
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15 | child_0: config.childIdentifer_0,
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16 | parent_1: config.parentIdentifer_1,
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17 | child_1: config.childIdentifer_1
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18 | };
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19 | this.throughTableName = config.throughTableName;
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20 | Relationship.createThroughModelFactory(this.ORM, this.modelFactoryName, this.throughTableName, this.identifer);
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21 | }
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22 | }
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23 |
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24 | Relationship.Types = {
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25 | belongsToOne: 'BELONGS_TO_ONE',
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26 | belongsToMany: 'BELONGS_TO_MANY',
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27 | hasOne: 'HAS_ONE',
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28 | hasMany: 'HAS_MANY'
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29 | };
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30 |
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31 |
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32 |
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33 |
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34 | Relationship.createThroughModelFactory = function(ORM, modelFactoryName, tableName, identifer) {
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35 |
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36 | var model = {
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37 | attributes: {}
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38 | };
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39 |
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40 | model.attributes[identifer.parent_0] = {};
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41 | model.attributes[identifer.parent_1] = {};
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42 |
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43 |
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44 | model.attributes[modelFactoryName] = function(context) {
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45 | return context.belongsToOne(modelFactoryName, identifer.child_1, identifer.parent_1);
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46 | };
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47 |
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48 |
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49 |
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50 | if(!ORM.models.hasOwnProperty(tableName)) {
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51 | ORM.Model.extend(tableName, model);
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52 | } else {
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53 | ORM.models[tableName].addTableAttributes(model.attributes);
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54 | }
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55 | };
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56 |
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57 |
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58 |
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59 |
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60 |
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61 | Relationship.prototype.createBelongsToOne = function(attributes, options) {
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62 | return ORM.models[this.modelFactoryName].create(attributes, options);
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63 | };
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64 |
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65 | Relationship.prototype.createBelongsToMany = function(attributesMany, options) {
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66 | var promises = [];
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67 | attributesMany.map((attributes) => {
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68 | var promise = this.createBelongsToOne(attributes, options);
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69 | promises.push(promise);
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70 | });
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71 | return Promise.all(promises);
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72 | };
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73 |
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74 | Relationship.prototype.createHasOne = function(attributes, parentModel, options) {
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75 | var newAttributes = Object.assign({}, attributes, {
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76 | [this.identifer.child]: parentModel[this.identifer.parent]
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77 | });
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78 | return ORM.models[this.modelFactoryName].create(newAttributes, options);
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79 | };
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80 |
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81 | Relationship.prototype.createHasMany = function(attributesMany, parentModel, options) {
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82 | var promises = [];
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83 | attributesMany.map((attributes) => {
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84 | var promise = this.createHasOne(attributes, parentModel, options);
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85 | promises.push(promise);
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86 | });
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87 | return Promise.all(promises);
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88 | };
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89 |
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90 |
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91 |
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92 |
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93 |
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94 | Relationship.prototype.attachAsAttribute = function(attributes, parentModel) {
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95 | var newAttributes = {};
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96 | newAttributes[this.identifer.child] = parentModel[this.identifer.parent];
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97 | return Object.assign(attributes, newAttributes);
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98 | };
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99 |
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100 |
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101 |
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102 |
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103 | Relationship.prototype.attach = function(childModel, parentModels, options) {
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104 | var promises = [];
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105 | parentModels.forEach(function(parentModel) {
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106 | var attributes = {
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107 | [this.identifer.parent_0]: childModel[this.identifer.child_0],
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108 | [this.identifer.parent_1]: parentModel[this.identifer.child_1]
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109 | };
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110 | var promise = this.ORM.models[this.throughTableName].create(attributes, options);
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111 | promises.push(promise);
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112 | }, this);
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113 | return Promise.all(promises);
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114 | };
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115 |
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116 |
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117 |
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118 |
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119 |
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120 | Relationship.prototype.include = function(table, childModel) {
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121 | var self = this;
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122 | var promises = [];
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123 | var query = {};
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124 | var promise;
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125 | switch(self.type) {
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126 | case Relationship.Types.hasOne:
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127 | case Relationship.Types.belongsToOne: {
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128 | query[self.identifer.parent] = childModel[self.identifer.child];
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129 | promise = self.ORM.models[self.modelFactoryName].findOne(query);
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130 | break;
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131 | }
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132 | case Relationship.Types.belongsToMany : {
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133 | query = {};
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134 | var include = [self.modelFactoryName];
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135 |
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136 | promise = new Promise(function(resolve, reject) {
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137 | var models = [];
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138 | query[self.identifer.parent_0] = childModel[self.identifer.child_0];
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139 |
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140 | self.ORM.models[self.throughTableName].find(query, {
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141 | include: include
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142 | })
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143 |
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144 | .then(function(throughModels) {
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145 | throughModels.forEach(function(throughModel) {
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146 | models.push(throughModel[self.modelFactoryName]);
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147 | });
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148 | resolve(models);
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149 | })
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150 | .catch(function(error) {
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151 | reject(error);
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152 | });
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153 | });
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154 | promises.push(promise);
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155 | break;
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156 | }
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157 | case Relationship.Types.hasMany: {
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158 | query = {};
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159 | query[self.identifer.child] = childModel[self.identifer.parent];
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160 | promise = self.ORM.models[self.modelFactoryName].find(query);
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161 | promises.push(promise);
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162 | break;
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163 | }
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164 | }
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165 | return promise.then((model) => {
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166 | childModel[table] = model;
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167 | return childModel;
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168 | });
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169 | };
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170 |
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171 |
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172 |
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173 |
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174 | Relationship.prototype.getThroughTable = function() {
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175 | return (this.type === Relationship.Types.belongsToMany)
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176 | ? this.throughTableName
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177 | : this.modelFactoryName;
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178 | };
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179 |
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180 |
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181 |
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182 | module.exports = Relationship; |
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