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fabiode/example.rb

Created January 18, 2022 17:52
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  1. fabiode revised this gist Jan 18, 2022. 2 changed files with 2 additions and 1 deletion.
    2 changes: 2 additions & 0 deletions example.rb
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    Original file line number Diff line number Diff line change
    @@ -1,3 +1,5 @@
    ### Example of Use

    class User < ApplicationRecord
    include ImageVariants
    has_one_attached :avatar
    1 change: 0 additions & 1 deletion image_variants_concern.rb
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    Original file line number Diff line number Diff line change
    @@ -55,5 +55,4 @@ def variant_image(size)
    end
    end

    ### Example of Use

  2. fabiode created this gist Jan 18, 2022.
    5 changes: 5 additions & 0 deletions example.rb
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    @@ -0,0 +1,5 @@
    class User < ApplicationRecord
    include ImageVariants
    has_one_attached :avatar
    image_variants_for :avatar, sizes: { custom_size: }, default_image: '/path/to/default/image'
    end
    59 changes: 59 additions & 0 deletions image_variants_concern.rb
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    @@ -0,0 +1,59 @@
    require 'active_support/concern'

    module ImageVariants
    extend ActiveSupport::Concern

    class_methods do
    attr_reader :_attachment_name, :_image_sizes, :_default_image

    def image_variants_for(name, sizes: _default_sizes, default_image: _image)
    @_attachment_name = name
    @_image_sizes = sizes
    @_default_image = default_image
    end

    def _default_sizes
    {
    avatar: { combine_options: { resize: '80x80^', extent: '80x80', gravity: 'Center' } },
    thumb: { combine_options: { resize: '256x256^', crop: '128x128+0-10', gravity: 'Center' } },
    card: { combine_options: { resize: '640x360^', crop: '640x360+0+0', gravity: 'Center' } },
    cover: { combine_options: { resize: '1280x720^', crop: '1280x720+0+0', gravity: 'Center' } }
    }
    end

    def _image
    '/default.png'
    end
    end

    included do
    after_initialize do
    define_singleton_method("#{self.class._attachment_name}_image") do |size = nil|
    _attachment.attached? ? variant_image(size) : self.class._default_image
    end
    end
    end

    private

    def image_variants(size)
    self.class._image_sizes[size.to_sym]
    end

    def _attachment
    public_send(self.class._attachment_name)
    end

    def variant_image(size)
    size = image_variants(size)
    if size && _attachment.blob.variable?
    variant = _attachment.variant(size)
    variant.processed.service_url
    else
    _attachment.service_url
    end
    end
    end

    ### Example of Use