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Schema-tutorialLes 4: Meerdere blogberichten tegelijk dupliceren

Les 4: Meerdere blogberichten tegelijk dupliceren

We kunnen de vorige tutorial-les uitbreiden om meerdere berichten te dupliceren met een enkel GraphQL-verzoek.

GraphQL-query om meerdere berichten tegelijk te dupliceren

Om deze GraphQL-query te laten werken, moet de Schemaconfiguratie die op het endpoint is toegepast, Geneste mutaties hebben ingeschakeld

Deze GraphQL-query dupliceert de berichten die zijn opgehaald via de opgegeven variabelen $limit en $offset:

query InitializeDynamicVariables
  @configureWarningsOnExportingDuplicateVariable(enabled: false)
{
  postInputs: _echo(value: [])
    @export(as: "postInputs")
    @remove
}
 
query GetPostsAndExportData($limit: Int! = 5, $offset: Int! = 0)
  @depends(on: "InitializeDynamicVariables")
{
  postsToDuplicate: posts(
    pagination: {
      limit : $limit
      offset: $offset
    }
    sort: {
      by: ID,
      order: ASC
    }
  ) {
    # Fields not to be duplicated
    id
    slug
    date
    status
 
    # Fields to be duplicated
    author {
      id
    }
    categories {
      id
    }
    rawContent
    excerpt
    featuredImage {
      id
    }
    tags {
      id
    }
    title
 
    # Already create (and export) the inputs for the mutation
    postInputs: _echo(value: {
      status: draft,
      authorBy: {
        id: $__author
      },
      categoriesBy: {
        ids: $__categories
      },
      contentAs: {
        html: $__rawContent
      },
      excerpt: $__excerpt
      featuredImageBy: {
        id: $__featuredImage
      },
      tagsBy: {
        ids: $__tags
      },
      title: $__title
    })
      @export(as: "postInputs", type: LIST)
      @remove
  }
}
 
mutation DuplicatePosts
  @depends(on: "GetPostsAndExportData")
{
  createPosts(inputs: $postInputs) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    post {
      # Fields not to be duplicated
      id
      slug
      date
      status
 
      # Fields to be duplicated
      author {
        id
      }
      categories {
        id
      }
      rawContent
      excerpt
      featuredImage {
        id
      }
      tags {
        id
      }
      title
    }
  }
}

Stap voor stap: de GraphQL-query opbouwen

Hieronder volgt een gedetailleerde analyse van hoe de query werkt.

De tutorial-les "Een blogbericht dupliceren" uitbreiden

De vorige les gebruikt de volgende strategie (in de GraphQL-query van de tweede aanpak):

  1. Exporteer de resource-ID's uit de velden (inclusief verbindingsvelden):
query GetPostAndExportData {
  post {
    author @export(as: "authorID") {
      id
    }
    categories @export(as: "categoryIDs") {
      id
    }
    rawContent @export(as: "rawContent")
    rawExcerpt @export(as: "excerpt")
    featuredImage @export(as: "featuredImageID") {
      id 
    }
    tags @export(as: "tagIDs") {
      id
    }
    rawTitle @export(as: "title")    
  }
}
  1. Maak het invoerobject voor createPost(input:) aan op basis van die dynamische variabelen:
mutation DuplicatePost
  @depends(on: "GetPostAndExportData")
{
  createPost(input: {
    status: draft,
    authorBy: {
      id: $authorID
    },
    categoriesBy: {
      ids: $categoryIDs
    },
    contentAs: {
      html: $rawContent
    },
    excerpt: $excerpt
    featuredImageBy: {
      id: $featuredImageID
    },
    tagsBy: {
      ids: $tagIDs
    },
    title: $title
  }) {
    # ...
  }
}

Dankzij de extensie Field to Input kunnen we het invoerobject al in de eerste operatie aanmaken en alle benodigde berichtdata exporteren onder één enkele dynamische variabele:

query GetPostAndExportData {
  post {
    author {
      id
    }
    categories {
      id
    }
    rawContent
    excerpt
    featuredImage {
      id
    }
    tags {
      id
    }
    title
 
    postInputs: _echo(value: {
      status: draft,
      authorBy: {
        id: $__author
      },
      categoriesBy: {
        ids: $__categories
      },
      contentAs: {
        html: $__rawContent
      },
      excerpt: $__excerpt
      featuredImageBy: {
        id: $__featuredImage
      },
      tagsBy: {
        ids: $__tags
      },
      title: $__title
    })
      @export(as: "postInputs")
  }
}

Daarna ontvangt createPost(input:) in de volgende mutatie rechtstreeks de dynamische variabele $postInputs:

mutation DuplicatePost
  @depends(on: "GetPostAndExportData")
{
  createPost(input: $postInputs) {
    # ...
  }
}

Meerdere berichten ophalen

We moeten de query omzetten om meerdere te dupliceren berichten op te halen:

  • Bevraag de berichten via posts(pagination: { limit : $limit, offset: $offset}) { ... }
  • Exporteer postInputs als een lijst (d.w.z. een array met alle invoergegevens voor de bevraagde berichten)
query GetPostsAndExportData($limit: Int! = 5, $offset: Int! = 0)
  @depends(on: "InitializeDynamicVariables")
{
  postsToDuplicate: posts(
    pagination: {
      limit : $limit
      offset: $offset
    }
    sort: {
      by: ID,
      order: ASC
    }
  ) {
    # ...
 
    postInputs: _echo(value: {
      # ...
    })
      @export(
        as: "postInputs",
        type: LIST
      )
  }
}

Meerdere berichten aanmaken in één GraphQL-query

De dynamische variabele $postInputs bevat nu een array met alle invoerdata voor elk te dupliceren bericht:

[
  {
    "status": "draft",
    "authorBy": {
      "id": "2"
    },
    "categoryIDs": [
      1
    ],
    "contentAs": {
      "html": "<!-- wp:paragraph -->\n<p>Welcome to WordPress. This is your first post. Edit or delete it, then start writing!</p>\n<!-- /wp:paragraph -->"
    },
    "excerpt": "Welcome to WordPress. This is your first post. Edit or delete it, then start writing!",
    "featuredImageBy": {
      "id": null
    },
    "tagsBy": {
      "ids": []
    },
    "title": "Hello world!"
  },
  {
    "status": "draft",
    "authorBy": {
      "id": "3"
    },
    "categoryIDs": [
      3
    ],
    "contentAs": {
      "html": "<!-- wp:paragraph -->\n<p>This is a paragraph block. Professionally productize highly efficient results with world-class core competencies. Objectively matrix leveraged architectures vis-a-vis error-free applications. Completely maximize customized portals via fully researched metrics. Enthusiastically generate premier action items through web-enabled e-markets. Efficiently parallel task holistic intellectual capital and client-centric markets.<br><br></p>\n<!-- /wp:paragraph -->\n\n<!-- wp:heading -->\n<h2>Image Block (Standard)</h2>\n<!-- /wp:heading -->\n\n<!-- wp:image {\"id\":1755} -->\n<figure class=\"wp-block-image\"><img src=\"https://d.pr/i/8pTmgY+\" alt=\"\" class=\"wp-image-1755\"/></figure>\n<!-- /wp:image -->"
    },
    "excerpt": "This is a paragraph block. Professionally productize highly efficient results with world-class core competencies. Objectively matrix leveraged architectures vis-a-vis error-free applications. Completely maximize customized portals via fully researched metrics. Enthusiastically generate premier action items through web-enabled e-markets. Efficiently parallel task holistic intellectual capital and client-centric markets. Image Block (Standard)",
    "featuredImageBy": {
      "id": 361
    },
    "tagsBy": {
      "ids": [
        11,
        10
      ]
    },
    "title": "Released v0.6, check it out"
  }
]

Ten slotte roepen we de bulk-mutatie createPosts aan om alle berichten aan te maken door de data van de geëxporteerde invoergegevens door te geven:

mutation DuplicatePosts
  @depends(on: "GetPostsAndExportData")
{
  createPosts(inputs: $postInputs) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    post {
      # Fields not to be duplicated
      id
      slug
      date
      status
 
      # Fields to be duplicated
      author {
        id
      }
      categories {
        id
      }
      rawContent
      excerpt
      featuredImage {
        id
      }
      tags {
        id
      }
      title
    }
  }
}

Ten slotte roepen we de bulk-mutatie createPosts aan om alle berichten aan te maken door alle invoergegevens door te geven:

mutation DuplicatePosts
  @depends(on: "GetPostsAndExportData")
{
  createPosts(inputs: $postInputs) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    post {
      # Fields not to be duplicated
      id
      slug
      date
      status
 
      # Fields to be duplicated
      author {
        id
      }
      categories {
        id
      }
      rawContent
      excerpt
      featuredImage {
        id
      }
      tags {
        id
      }
      title
    }
  }
}

Overbodige data verwijderen

De laatste stap is het verwijderen van alle hulpvelden (waarvan we de uitvoer niet hoeven af te drukken in het antwoord) via @remove.

De geconsolideerde GraphQL-query is:

query InitializeDynamicVariables
  @configureWarningsOnExportingDuplicateVariable(enabled: false)
{
  postInputs: _echo(value: [])
    @export(as: "postInputs")
    @remove
}
 
query GetPostsAndExportData($limit: Int! = 5, $offset: Int! = 0)
  @depends(on: "InitializeDynamicVariables")
{
  postsToDuplicate: posts(
    pagination: {
      limit : $limit
      offset: $offset
    }
    sort: {
      by: ID,
      order: ASC
    }
  ) {
    # Fields not to be duplicated
    id
    slug
    date
    status
 
    # Fields to be duplicated
    author {
      id
    }
    categories {
      id
    }
    rawContent
    excerpt
    featuredImage {
      id
    }
    tags {
      id
    }
    title
 
    # Already create (and export) the inputs for the mutation
    postInputs: _echo(value: {
      status: draft,
      authorBy: {
        id: $__author
      },
      categoriesBy: {
        ids: $__categories
      },
      contentAs: {
        html: $__rawContent
      },
      excerpt: $__excerpt
      featuredImageBy: {
        id: $__featuredImage
      },
      tagsBy: {
        ids: $__tags
      },
      title: $__title
    })
      @export(as: "postInputs", type: LIST)
      @remove
  }
}
 
mutation DuplicatePosts
  @depends(on: "GetPostsAndExportData")
{
  createPosts(inputs: $postInputs) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    post {
      # Fields not to be duplicated
      id
      slug
      date
      status
 
      # Fields to be duplicated
      author {
        id
      }
      categories {
        id
      }
      rawContent
      excerpt
      featuredImage {
        id
      }
      tags {
        id
      }
      title
    }
  }
}