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class="page-title">GQLScalar</h1> <section> <header> <h2> GQLScalar </h2> </header> <article> <div class="container-overview"> <div class="section-method"> <h4 class="name" id="GQLScalar">new GQLScalar()</h4> <div class="description"> GQLScalars are how one might construct their own types for use within GraphQL with Lattice. The descriptions below should be sufficient to get you started with your own types. The SDL for a Scalar looks like this: <pre class="prettyprint source"><code>scalar MyType</code></pre> </div> <dl class="details"> <dt class="tag-source">Source:</dt> <dd class="tag-source"><ul class="dummy"><li> <a href="GQLScalar.js.html">GQLScalar.js</a>, <a href="GQLScalar.js.html#line12">line 12</a> </li></ul></dd> </dl> </div> </div> <h3 class="subsection-title">Members</h3> <div class="section-members"> <h4 class="name" id=".%E2%AC%87%EF%B8%8E%E2%A0%80GQL_TYPE">(static, constant) ⬇︎⠀GQL_TYPE</h4> <div class="description"> Determines the default type targeted by this GQLBase class. Any type will technically be valid but only will trigger special behavior </div> <dl class="details"> <dt class="tag-source">Source:</dt> <dd class="tag-source"><ul class="dummy"><li> <a href="GQLScalar.js.html">GQLScalar.js</a>, <a href="GQLScalar.js.html#line24">line 24</a> </li></ul></dd> </dl> </div> <h3 class="subsection-title">Methods</h3> <div class="section-method"> <h4 class="name" id=".parseLiteral">(static) parseLiteral(ast) → {mixed}</h4> <div class="description"> Similar to <code>parseValue</code>, but rather than receiving the input values from a query or from a query variable, the data comes in the form of a parsed abstract syntax/source tree (AST). It is the job of <code>parseLiteral</code> to convert from an AST type to the desired output value. An example that converts all Strings to Numbers and vice versa <pre class="prettyprint source lang-javascript"><code>static parseLiteral(ast) { const { Kind } = require('graphql/language') switch (ast.kind) { case Kind.INT: case Kind.FLOAT: return String(ast.value) case Kind.STRING: return parseFloat(ast.value) default: return null; } }</code></pre> </div> <dl class="details"> <dt class="tag-source">Source:</dt> <dd class="tag-source"><ul class="dummy"><li> <a href="GQLScalar.js.html">GQLScalar.js</a>, <a href="GQLScalar.js.html#line95">line 95</a> </li></ul></dd> </dl> <h5>Parameters:</h5> <table class="params"> <thead> <tr> <th>Name</th> <th>Type</th> <th class="last">Description</th> </tr> </thead> <tbody> <tr> <td class="name"><code>ast</code></td> <td class="type"> <code>Object</code> </td> <td class="description last"> the parse value of the type given some literal SDL syntax. Presumably this is where you can choose to take a String, for example, and convert it to an integer when Kind.STRING is supplied. </td> </tr> </tbody> </table> <div class="section-returns"> <h5>Returns:</h5> <dl class="param-type"> <dt> Type: </dt> <dd> <code>mixed</code> </dd> </dl> <div class="param-desc"> the value of the conversion, given input. </div> </div> </div> <div class="section-method"> <h4 class="name" id=".parseValue">(static) parseValue(value) → {mixed}</h4> <div class="description"> Parse value handles input from the client. In this form, the value is taken directly from the sent query. The type of the value can be nearly anything, but the <code>parseValue</code> function's job is to interpret the input and return the understood value. You could have a ColorBlind scalar type that took in a hexadecimal color string and converted it to a color scheme as seen by those with some form of color blindness. The value supplied to <code>parseValue</code> would be the input color. The modified color would be the output value. <pre class="prettyprint source"><code>query { showMe(colorBlind: '#ff0000') { color } } // this might convert to #c65100</code></pre>This can also cover input sent in the form of variables. The variable can be of any valid JSON type. </div> <dl class="details"> <dt class="tag-source">Source:</dt> <dd class="tag-source"><ul class="dummy"><li> <a href="GQLScalar.js.html">GQLScalar.js</a>, <a href="GQLScalar.js.html#line58">line 58</a> </li></ul></dd> </dl> <h5>Parameters:</h5> <table class="params"> <thead> <tr> <th>Name</th> <th>Type</th> <th class="last">Description</th> </tr> </thead> <tbody> <tr> <td class="name"><code>value</code></td> <td class="type"> <code>mixed</code> </td> <td class="description last"> the input sent from a query that needs to be converted to an internal value for GraphQL to proceed </td> </tr> </tbody> </table> <div class="section-returns"> <h5>Returns:</h5> <dl class="param-type"> <dt> Type: </dt> <dd> <code>mixed</code> </dd> </dl> <div class="param-desc"> the converted output given the input; this will be purely how you want your scalars to function. </div> </div> </div> <div class="section-method"> <h4 class="name" id=".serialize">(static) serialize(value) → {mixed}</h4> <div class="description"> The <code>serialize</code> method is called by GraphQL when the type is going to be sent to the client. Since values on the client are in the form of JSON, the return value of <code>serialize</code> can be any valid JSON value; String, Number, Array, Object, etc... </div> <dl class="details"> <dt class="tag-source">Source:</dt> <dd class="tag-source"><ul class="dummy"><li> <a href="GQLScalar.js.html">GQLScalar.js</a>, <a href="GQLScalar.js.html#line40">line 40</a> </li></ul></dd> </dl> <h5>Parameters:</h5> <table class="params"> <thead> <tr> <th>Name</th> <th>Type</th> <th class="last">Description</th> </tr> </thead> <tbody> <tr> <td class="name"><code>value</code></td> <td class="type"> <code>mixed</code> </td> <td class="description last"> the value that needs to be converted for the downstream JSON client side result. </td> </tr> </tbody> </table> <div class="section-returns"> <h5>Returns:</h5> <dl class="param-type"> <dt> Type: </dt> <dd> <code>mixed</code> </dd> </dl> <div class="param-desc"> any valid JSON value </div> </div> </div> </article> </section> </div> <footer> Generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Sat Feb 17 2018 00:27:32 GMT-0800 (PST) using the Minami theme. </footer> <script>prettyPrint();</script> <script src="scripts/linenumber.js"></script> </body> </html>